Xavier: “Uh, Doc? Going around with an open lab coat and gas mask doesn’t count as a costume. I thought we agreed on that Tasque Manager costume before.

Alrone: “Apparently she’s quite a favorite character to a lot of people, so I have to make do with the short amount of time.”

Xavier: “Okay, who are you supposed to be anyway?

Alrone: “Dr. K”

Xavier: “Who’s Dr. K? Also what happened to your left hand?”

The costumes being referenced are owned by their original owners.

Ralsei and Spamton - Deltarune by Toby Fox
Skid and Pump - Sir Pelo
The two latex beast - Changed Special Edition by Dragonsnow or Snowdragon.