After becoming a free ride to everyone in the underground, Opal became known as the Riverman. She would give her service to anyone, even genocidal humans. It never got her killed cause Opal would never enter a fight. She always survived Genocide routes that way, she and the shopkeepers would never enter fight, which is how they survived. In fact, she didn't even seem to know or care about what the human had done.

"Hey" the human said. "I need a ride to Waterfall"

"Tra la la. Oh, of course get in human." She answered.

The human got in, interested to see what odd thing Riverman would say this time.

"Tra la la. My, I probably should have worn a few million more pairs of pants today." She said.

The genocidal human rolled there eyes. If course Riverman would say something random. And what's with the weird "Tra la la" before everything? The human got off at Waterfall to grab something from Gerson, and went back to the Riverman.

"Tra la la. Back again, human? Where do you want to go?"

" Hotland" they answered.

"Tra la la. Did you ever hear the old song coming from the sea?" She said.

Another random line. Eh, they where about to face Mettaton, so they didn't see how it mattered what this weird Riverman had to say.