Characters:

Touma, Accelerator – Sans

Last Order, Index – Papyrus.

Kuroko – Chara.

Misaka Mikoto – Frisk

Uihara – Alphys.

Shokuhou – Mettaton.

Stiyl – Grillby.

Tsuchimikado – Normal citizens.

Saten – Toriel.

Tsuchimikado – Asgore.

Kihara Gensei- W.D Gaster.

Shundan Kimi – Undertale Red.

Gunha – Undyne

And others are all just normal citizens.