BehaviorHoppers erratically jump around the room slowly, dealing Isaac with contact damage if he gets too close to them.
They can turn into a Flaming Hopper by touching a Fireplace.
- In Rebirth, they can be spawned by the boss Mega Maw.
- Hoppers and Flaming Hoppers are the only known enemies that do not take damage, yet even profit from contact with Fireplaces.
- Hoppers and Leapers (also the Trites) are probably a reference to a Zelda enemy called Tektite, a spider-like enemy that also only moves around by jumping.