Reacher

"Hope you'll stay close." -A Reacher, Super Mario RPG: Legend of the Seven Stars

Reachers are skeletal ghosts who inhabit the Sunken Ship in Super Mario RPG: Legend of the Seven Stars. Reachers are possibly one of the creepiest ghosts on the Sunken Ship, they resemble large, sad and humanoid skeletons whose body is obscured by a tombstone. Reachers attack by reaching towards a party member (hence the name) and also by hurling a large bone (similar to Dry Bones), also they will sing a haunting lullaby which will stop a party member from using magic.

Considering Reachers have high attack, defence and HP it is probably wise to use magic or Pure Water on them. Like most powerful enemies in Mario RPG more than one Reachers never appears in battle, instead Reachers simply aid other ghouls.