These are absolutely lovely.
However, I have some suggestions(Listen or ignore, YC.)
Armored Armadillo and Spark Mandrill both feel a little too light...
Especially Armadillo.
Also, Flame Mammoth's jump press is missing the little "reeeooour"
http://www.mediafire.com/?6pz5tmaj3ld4no6 power-up sfx,
as is Kuwanger's teleport missing the "voom, voom"
http://www.mediafire.com/?p3m4a9ra54wlkal and these things help make the
difference between...
1-I am playing as this character.
or
2-I AM this character.
And Kuwanger's teleport feels a little off in some other way I can't describe...
Too fast?
Not enough control?
Chill Penguin's blizzard needs to do at least 1 AOE damage...
Feels weird otherwise.
Great Sfx tho.
Also, when using a secondary weapon, alt fire should still do something(Melee?),
simply because it seems a bit bare for some chars.
Other than that everything is perfect.
This is even better than classes!
(Or it will be, once the skins are done.)