from left to right:

blue football zombie:

bascially all-star in pvz2, runs very fast at first, destroys the first plant it hits, then it becomes slow

ninja imp:

after a certain duration, enter sneak mode for a few seconds where it ignores plants and plant attakcs ignores it

disco zombie:

every 9 secs, spawn dancers around him or heal every zombie nearby by 100HP if there's alr 4 dancers

paper zombie:

slightly more hp than a browncoat; throws paper balls to plants at a distance dealing chip damage

paper box imp:

imp but with some extra hp

(imps moves fast and are immume to many straight projectiles due to their small hitbox)