KillPlant

 KillPlant is a virus from the Mega Man Battle Network series. They are stationary plant-type viruses that spit out seeds. If the seed does not land on a target, it stays on the panel. A few seconds later, the seed turns into a target-seeking wooden spike.

KillPlant
 KillPlants are red-orange with a light-green base.

KillWeed
 KillWeeds are blue with a dark-green base.

KillFleur
 Shrimpy3s are black with a purple base.

ShrimpyΩ
 ShrimpyΩs are black with red stripes.

Source
Sprite images found at Sprites INC