Natsu is fire right?
[img=http://pokedream.com/games/shared/battlechart/battlechart.png]
Ris uses earthquake... It's super effective! 

Charlie can be beaten by anyone capable of good controlling magic, for example, Ciskel will defeat him effortlessly.
Rangifer is rather average, he will freeze you and be fast, but if you can overcome that he doesn't have many tricks up his sleeve.
Ciskel is probably the strongest character I have, power wise, but he specializes in 1v1. In all out brawl, fear Chelsey.
Chelsey will massacre anything.. save for Inigo since he eats shadow and in that mach-up turning into a shadowmonster is a less than ideal plan.
I don't think I have to mention Algon :)