Wait where is that Adam sprite from? And is this because he has a habit of stabbing people who are prone or downed?

I don't mean to be the "technically" guy, but, in general, BB games let you attack enemies on the ground. Some characters, however, like ragna and noel, have moves that only work on downed enemies

Adachi has the time of his life

Noel? Noel has a move you can only use on grounded enemies and it has two variants.

there are some characters i dont reconise from the game like adam torus, the cick with red pig-tails, ect

Terumi is the only guy in 2D/Anime fighters who can hurt downed enemy,
Funny.
Peoples rip hearts, spines and sometimes are super evil in Mortal Kombat but even worst of the worst won't dare to hurt downed enemy.