I'm pretty open to making plans with as many people as want them, I've also got as many memories as is desired, I'm sure.

I'll do the details per character but the basics:

Wednesday: Mostly benign memories, a lot of school life.
Demyx: Could do some silly, mission-type memories, on the lighthearted end. On the darker end, some memory fuckery, being trapped in a situation that's impossible to get out of. Potential death.
Yato: One hell of a walking trigger warning. Murder, child abuse, dismemberment. There are not a lot of good memories to draw upon. It can be done, but there's only a few.