This accidently turned into a semi reference sheet.

What happened was I was just going to draw Rust and then I thought of her color scheme a little, particularly the belt having blue. So because of that I thought about the order of how the humans fell in Rust's AU.

I'll probably explain more in depth some other time, but basically Rust does not make a deal with whoever would be in Chara's place. She is aided by the last fallen human that died, which in Rust's AU is Integrity. Mostly because in some AUs, Integrity killed some monsters so it kind of makes sense. They probably were corrupted by hate a bit and most likely awakened due to that or a glitch. [Frisk is a hacker in this AU].

I also learned from this, I hate drawing ballet shoes- might alter their design sometime.