Chara's cheeks, already with a cutesy blush by default that they absolutely hate even in it's occasional utility, start spilling red out onto the rest of their face entirely against their will. There's only so far pretending it's a flush of anger can take them.

This Frisk isn't the only one amused, although the unseen one is making a token effort at contrition that's not entirely sincere, or working. This only makes things worse on Chara's end. Betrayal!

Chara does their best to rally, fingers closing and opening by their sides as they draw themselves up. It would be perhaps more impressive if they weren't twelve and wearing bright colours, although the blood from scraped knuckles and cut glass probably does add a bit to it.

"If you have a more fitting definition for an un-natural creature with red eyes and inhuman powers that makes deals, by all means tell me it."

*D'you want a shovel?

Shut.