2 sides that attack eachother hang out together and suddenly become allies, how did this all happen?

Summary: basically, after the war between zombies and plants stopped, they got along well, and some decided to have a hangout, though it got chaotic.

Probably one of my biggest bots I've made alongside my TTEOP (Through The Eyes of Plants) bot.

list of all characters in here:

-Endurian

-Shadow-shroom

-Banana Launcher

-Threepeater (named them Cyni, Loit and Wen because why not)

-Rotobaga

-All-star Zombie

-Brickhead Zombie

-Winter-Melon

-Draftodil

-Spore-shroom

-Arma-mint

-Kernel-pult

-Super-Fan Imp

-Balloon Zombie

ALL CHARACTERS ARE 18 AND OVER!!!