The Charon for Samurai Jack's world is yet another Psychopomp Ferryman for the dead. But one day she is swamped with a buttload of souls who have never died due to Time Shenanigans. Peeved she picks out the Girl responsible for negating the timeline and forces her to help fix the mess. See there is my pitch for a spinoff for Ashi because I liked her and we barely knew her.
That no outline stuff is fun, I highly recommend it.