So this is my take on a Familiar of Zero and RWBY crossover I hope you enjoy. I own neither Familiar of Zero nor RWBY. Shout out to Imyoshi for allowing me to use his ideas in this fic and Blacklight181 for all his advice and giving me a name for Jaune's new weapon. Check out their stories. Also Jaune's background is the same from my story A Knight's Final Fight.

Chapter 1- A Knight in a New World

Location- A ravine in Remnant about half way down

Jaune's P.O.V

Its official Oum is out to get me. After I told my team and team RWBY about my fake transcripts they told the rest of the school and became Beacon's most hated student. Nothing I wasn't used to with my childhood. Ozpin told the student body he kept me around for my tactical skills but it didn't help me, I was still despised. After taking a blow for Weiss on a training mission and upon waking up in the hospital two weeks later and learning they didn't even visit me I decided to leave. I left my armor, Crocera Mors, and a thank you note for Ozpin for all he had tried to do for me. I came to the conclusion that I was destined to be alone in the end. This lead to me unlocking my semblance Shadow Manipulation or Erebokinesis. My aura also turned pitch black and felt colder than before, a side effect of my new mentality I believe. I began to test every possible facet of my semblance. I soon discovered the only limit is my imagination.

Unfortunately my new ability attracted unwanted attention. Four months after I left Beacon a woman named Salem approached me. She looked like she was part Grimm because of her eyes, I honestly believe this is true. She had an aura around her that gave off the felling of utter despair. My power over shadows intrigued her and she wanted my help in destroying Beacon. I may not care about anyone there except Ozpin, sad how the only person I care for I've only talked to a few times, but I don't want them dead so I refused to help. My refusal was not well received. I used my semblance to travel through my shadow and hightailed it out of there.

Since then I've been pursued by Grimm constantly for the past week further reinforcing my idea that Salem is part Grimm. The only reason I'm alive is because of my Enslaved , creatures whose shadows I've stolen, I tested what would happen if a took a creature's shadow on a whim and discovered what might be my best skill. When I take a shadow the body becomes a puppet to my will and they lose most of their color gaining a black undertone. It even works on Grimm although they only gain my crest on their masks. Luckily I can store the Enslaved in my shadow and release them whenever I want. Upon defeat they retreat into my shadow so I never have to replace them although the defeated have a "recharge time" before they can be used again and I can control them mentally. This has allowed me to stall, escape, and defeat my pursuers and add some of them to my forces.

This last time was different the Grimm were supercharged for lack of a better word. My Enslaved were mown down and I was tossed around like a rag doll. I managed to take quite a few down with new techniques I had created but the numbers they had were too high. I ran out of aura despite my massive reserves and fast production rate leading to me having to focus on dodging but exhaustion set in. A Beowolf managed to slash me across the chest followed by an Ursa whacking me into the ravine I'm currently falling into. Any aura I'm producing is going into keeping me alive. I don't have enough for any techniques that could save me. This is the end for me.

"My name is Louise Francoise le Blanc de la Valliere."

Who the hell was that? No one is about to go splat with me.

"Pentagon of the five elemental power, Heed my summoning… and bring forth…. My familiar!"

A light surrounds me and I finally pass out from blood loss.

P.O.V change- Louise

My name is Louise Valliere, youngest child of the Valliere family. I go to Tristian's magic academy where I am constantly teased for my lack of both figure and magical prowess. My mother is Karin of the Heavy Wind which places an enormous amount of pressure to succeed on me. It doesn't help that my family views me as a failure. Only my sister Catteya believes I have any potential.

Every spell I cast ends in an explosion. Leading to my title Louise the Zero. I only have one chance to keep myself in the academy. I must succeed in today's summoning ritual or I will be forced to leave the academy. I was told to go last to prevent anyone from being injured before they did their summoning.

Professor Colbert has told me to go and I stand in front of the whole 2nd year now. This is my last chance to prove I'm not a zero. Failure is not an option. I begin the chant. "My name is Louise le Blanc de la Valliere. Pentagon of the five elemental power, Heed my summoning… and bring forth… My Familiar!" After I finish the spell a flash of light occurs and a gale of wind tears up the ground. I grip my skirt to keep it down and shut my eyes. When the wind stops I open my eyes only for my heart to drop. There is nothing there only a cloud of dust. Kirche, my rival and bully, begin to rile up the other students as a chant of "Louise the Zero" starts up. I promised they would never see me cry but tears start to slip through.

A groan reaches my ears through the taunts of the crowd. The dust clears to reveal a blond boy lying on the ground covered in cuts and blood. I call out to Professor Colbert "Professor Colbert this boy is injured." Kirche snidely comments on the events "Looks like you killed your familiar Zero." Professor Colbert rushes over and checks his pulses a frown crossing his face. "Miss Valliere didn't cause this. This boy has claw marks I've never seen before over his heart and he's lost a lot of blood. Miss Valliere finish the summoning ritual, the burst of energy should save this boy." I proceed to over to the boy. He's quite pale and barely breathing. I hope he can forgive me for what I'm about to do. This is tantamount to making this boy a slave.

"Pentagon of the Five Elemental Powers, grant your blessings this creature and bind it as my familiar." I lean down and kiss him on the lips to create the contract. Afterwards a glow appears under the boy's left glove and his breathing becomes steady. Professor Colbert levitates him and we take him to the infirmary. When the nurse examined him we saw a black energy appear on his wounds and heal them. A few hours after the nurse left and the moons had risen he began to groan and his eyes fluttered open.

Jaune's P.O.V.

Where am I? The last thing I remember was falling down a ravine and a voice calling out to me. Now I find myself on a bed with several people surrounding my bed. My eyes are drawn to a petite, pink haired girl. I can feel a connection to her for some reason. A balding man is suddenly in my face studding me. "You look completely fine. Can you take off your left glove please?" I'm honestly too creeped out to refuse and remove the glove. "I don't know why you want to…. HOW IN OUM'S NAME DID THAT GET THERE." On the back of my left hand are some markings I don't recognize. I notice the pink haired girl flinch in a guilty manner. The balding man examines the markings then leaves while telling the girl, who is apparently named Louise, to tell me what occurred. A look of fear is in her eyes when she turns to me.

Louise takes a deep breath and begins to speak "My name is Louise de la Valliere. I summoned you as my familiar and those marks on your hand signify that you are my servant. I'm sorry for ripping you away from your home but the summoning reaches out for a "creature" compatible with your soul. If you wish to leave I won't stop you." At this point she begins to stammer and become impossible to understand. I hold a hand up to stop her.

"You clearly didn't mean to summon me. Plus you saved my life, if you hadn't of summoned me I would have died…" seeing the question form on her lips I divulge some more details "… An Ursa had knocked me into a ravine and I didn't have the aura to pull off any tricks to save myself." Louise seems even more confused and clearly can't hold it in. I signal her to ask her questions to avoid confusion. "What's an Ursa and Aura?" Okay I'm slightly concerned. Some cultures have different names for Grimm but Aura is a multi-cultural word. The fact she doesn't know what it is worries me. "Ursa, big, bear-like grimm." When Louise asks what a grimm is I can't keep the shock off my face. I need some fresh air before I try to figure this out. I get off the bed and move over to the window. Upon opening the window I looked out the window to see something that made me freeze. Two whole moons are up in the night sky. I turn to Louise a suspicion forming in my head. I need to perform a test to check my hypothesis. "Louise do the word's White Fang, faunus, Beacon, Vale, Atlas, Vacuo, Mistral, and Semblance mean anything to you?" Louise reply's that those words mean nothing to her proves my suspicion. I have been pulled onto a different world. Not impossible considering how crazy some semblances have been known to be.

A laugh escapes from me. Then another and another. Soon I'm cackling like a mad man {1} causing Louise to gain a worried expression. I gain control of my laughter despite how hilarious I find this. I finally escaped from the world that caused me so much pain. I turn to Louise, my savior, and address her. I ask her not to interrupt till I'm done talking.

"I'll be straight with you Louise I'm from another world. In this world grimm are soulless, literally, monsters that seek to elemintate all of humanity and faunus-kind. I shall go into the history and politics of my world later. On the day I was born a large force of grimm attacked the town I was born in. My grandfather died protecting me that night. I was blamed for the attack and his death and turned into a pariah. I lived my life on the streets worrying each day was my last. One day I received a package with fake transcripts to beacon, the premier Huntsman academy, seeing a chance to escape the town I lived in and to help people I stole my late grandfather's sword and shield and ran off to Beacon. Upon arrival and being put into a team I thought I made friends but that was a lie. When they learned of my fake transcripts they didn't even ask for my side the story…" Rage leaks into my voice here. I will never forgive them for throwing me away without listening to me. "… I put up with it for a while but after nearly dying saving someone and upon waking up and learning they didn't care I nearly died I decided to leave. I ditched my armor, sword, and shield and ventured into the wild. I discovered myself and became quite strong after that. I ran into a complete psychopath who controlled grimm. She wanted my help, I refused and that led to the circumstances of me falling down that ravine."

It feels good to vent about what I've been through and done. "You saved me from a dying and got me out of a world that brought me nothing but pain…" I put my left hand over my heart and bow "… I, Jaune Arc, swear to serve you till I die. I will be your shield that block all blows aimed at you and the sword that smites your enemies. This is the vow I make to you. From this day forward I will strive to be the greatest familiar you can ask for."

Louise's face is completely blank but soon she begins to speak "Summoning a familiar was my last chance to stay in this school. I'm considered an utter failure here and at home. Only one of my sisters has ever believed in me. Based on what you told me we truly are compatible. Two outcasts bound together…" a smile appears on her face, one that clearly hasn't been there in a long time. "… I accept this vow of yours."

Most people would think I'm crazy for accepting being ripped from my world but my old world held nothing for me. From now on I serve Louise until the end. Not only because she saved my life but because of her eyes. I see those eyes every time I look at my reflection. Eyes filled with despair and loneliness. I will not let someone be alone like I was. Upon these ruins I swear, I will protect Louise from all threats.

{1}- think lelouch from code geass laugh