i dont have a full idea so i kno im not in the rite forum
but
it can be like a fly trap or something
one ability can grow plants from the ground and grab the enemy and slow
another ability can be like photosynthesis and be like a meditate on yi
another ability can kinda be like amumus bandage but with like a stem or leaf or somthing
and his ult, he can gobble up an enemy in his mouth and choose the direction he wants to spit them out.
It wont do a lot of damage or everyone would freak out, but it could snatch someone up in a teamfight and spit em towards a turret or allies
his passive can beee (making this up as i go lol)
idk the passive can be up to you guys

not a great idea but i think there needs to be plants not people/monsters

Maokai