Chara > Babsans Careful, Chara, you're turning into Zacharie

Maybe I'm reading too much into the soul exchange, but I really do think they have that preference for interactions being trades

This one does, at least.

Deals and trades make sense and give control

there's also the #just demon things aspect

That's why they went back with their Frisk after Genocide, because they finally had something they could bargain with and a way to hold Frisk to the deal.

That's why in Castle Perrault they used up One Favor for dustless Frisk in stopping from attempting to kill their alternate self.
Got to clear their debts as soon as possible in the way they see fit.

Before people abuse them.

If I ever do a CR chart for them it'd be probs take that format of the current state of this ephemeral bank balance.

Shamelessly kind of tweaking Bird's LV counter