I actually thought Ludicolo for Demyx. Sure, it's too energetic, but it's equally carefree. Also, "Dance, water dance!"
Cryogonal is pretty spot-on for Vexen.
Don't say that name in this topic (Cryogonal)
One of the stupidest ****ing pokemon I've ever seen. Next to CofragiarusnnaosfIDONTEVENGIVEA****ABOUTSPELLINGITRIGHT --- The mind of the subject will desperately struggle to create memories where none exist... ~~Just give me all the bacon and eggs you have~~