Just pick what you think will be your main 8 this game. Tons of threads of this on the SSA Forum... So I thought I might ask what people think they will use. It will be interesting to see, for example, if people decide to go for Hot Dog or someone and they end up being bad.
Magic: Pop Fizz. He is just really cool and looks fun. Series Two Spyro's design just pushes me away from him, and I dislike the rest.
Earth: Series Two Prism Break- though I am going to buy his LightCore then switch once it becomes available. I like Bash but I prefer Prism Break, Flashwing looks uninteresting, Terrafail is boring to me, and even if I wanted Dino-Rang he's staying with one figure.
Water: Series Two Slam Bam. Chill was very close, but she is a Ranger, and that would unbalance things. Wham-Shell gets no repose, and I don't enjoy Zap that much.
Fire: Flameslinger because he is getting the most epic Series Two and is one of the coolest in general. The rest just don't contend for me honestly.
Tech: Sprocket. Boomer gets no repose, Drill Sergeant and Drobot bore me, and Trigger Happy just doesn't work in Battle. AND she's my overall favorite... Which instantly gives her a free pass to STEEL WITH IT.

Undead: Fright Rider. I love his accent. I will dearly miss Chop Chop, though. I dislike Hex and Cynder and Ghost Roaster isn't Series Two.
Air: Jet-Vac. He looks viable and the Air Element is pretty much even anyway, so even if he's overpowered it won't bother me, and I got rid of Gill Grunt who he seems a bit similar to. Whirlwind is just getting kind of boring, Warnado is Series One only and Sonic Boom and Lightning Rod don't deserve a spot to me simply because I enjoy them less than the others(though in Air that's still saying something).
Life: Series Two Stump Smash. I really like his FFUUUUUigure and he was really fun in Series One. The rest, I just don't enjoy as much. Shroomboom might still be an occasional pick however.