It's "Final Form" Teddie! I don't know if the above is his actual form, though.
As for those insta-kill moves, they're apparently like BlazBlue's "Astral Heat" things, basically ways to just end a match in the final stages, with various preconditions in place, such as being in match point with a full SP bar. It shouldn't be cheap, at least in theory, but I'm no fighting game aficionado, so I'm in no position to judge.Photo Gallery: (3 images)
Click to zoom - browse by swipe, or use arrow keys
can cause it. You can fix it by adding *.disqus.com to your whitelists.