Hopper

Hoppers are headless monsters resembling Isaac's body with a tiny hole where their heads should be. They appear in The Binding of Isaac and the Rebirth remake.

They can be found frequently in The Basement and less frequently in The Caves.

Behavior

Hoppers 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.

Eternal Champion Behavior

Eternal Hoppers take longer to start jumping, but will jump directly towards Isaac with every jump and fire tears in the cardinal directions every time they land.

Notes

• In Rebirth, they can be spawned by the boss Mega Maw.

Trivia

• 

  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^[1], a spider-like enemy that also only moves around by jumping.

References

Monsters
Insects
Black Fly • Attack Fly • Moter • Eternal Fly • Pooter • Fat Fly • Boom Fly • Red Boom Fly • Drowned Boom Fly • Sucker • Spit • Dart Fly • Swarm Fly • Ring Fly • Level 2 Fly • Full Fly • Hush Fly • Ball of Flies • Spider • Big Spider • Trite • Ragling • Rag Trite • Level 2 Spider • Ticking Spider • Baby Long Legs • Crazy Long Legs • Wall Creep • Blind Creep • Rage Creep • Para-Bite • Cod Worm • Scarred Para-Bite • Round Worm • Nightcrawler • Roundy • Ulcer • Maggot • Charger • Spitty • Conjoined Spitty • Drowned Charger • Grub • Clotty • Clot • Mega Clotty • Leech • Kamikaze Leech • Holy Leech
Objects
Boil • Gut • Sack • Blue Boil • Host • Red Host • Wall Hugger • Slide • Poky • Stone Grimace • Vomit Grimace • Gaping Maw • Turret Grimace • Brimstone Grimace
Humanoids
Mulligan • Mulligoon • Mulliboom • Hive • Swarmer • Nest • Drowned Hive • Hopper • Flaming Hopper • Leaper • Pacer • Gusher • Splasher • Gaper • Frowning Gaper • Gurgle • Mr. Maw • Flaming Gaper • Cyclopia • Skinny • Rotty • Null • Greed Gaper • Blue Gaper • Swinger • Horf • Psychic Horf • Globin • Gazing Globin • Black Globin • Dank Globin • Knight • Selfless Knight • Floating Knight • Bone Knight • Bony • Black Bony • Fatty • Flaming Fatty • Conjoined Fatty • Blue Conjoined Fatty • Pale Fatty • Keeper • Hanger • Vis • Double Vis • Chubber • Cage Vis • Scarred Double Vis • Homunculus • Begotten • Dople • Evil Twin
Body parts
Mask + Heart • Brain • MemBrain • Guts • Mama Guts • Eye • Bloodshot Eye • Mom's Hand • Dead Mom's Hand • Scarred Guts • Nerve Ending • Stone Eye
Poop
Dip • Corn Dip • Brown Dip • Squirt • Dank Squirt • Dinga
Flyers
Maw • Red Maw • Psychic Maw • Death's Head • Dank Death's Head • Flesh Death's Head • Lil' Haunt • Wizoob • Red Ghost • One Tooth • Fat Bat • Tumor • Psy Tumor • Camillo Jr. • Baby • Angelic Baby • Imp • Dukie • Oob • Black Maw
Others
Fred • Lump • Embryo • B. Licker