A green living pile of Goop.
They Like to stay in a pile of goo(Which they are unnaffected by weapons and items), while waiting to attack or while moving, it only shows it's ChuChu form when it's about to jump at you.
If it isn't in the goop animation -All short range items effect it. -Shield Bash, Boomerang, & Hookshot Stun it. -Fire Arrow burns it, Ice Arrow Freezes it -Projectile weapons damage it as well.
1 HP It jumps at you.