One of its attacks involves it using its trunk to pull enemies towards it.
As of the finale of Kingdom Hearts Union X, they're no longer seen as this trope, due to The Reveal that they're the hearts of ancient, asleep Keyblade Wielders that fused with the original Dream Eaters, the Chirithy. When their instinct is Attack! Attack! Attack! (unlike Donald and Goofy in the main games, changing your Dream Eaters' battle habits is a bit more complicated), you need to simply block before the spirits destroy the nightmares. The Dream Eaters provide much help, but not when one of the link portal challenges involves blocking enemy attacks.
Note that he immediately runs off to cuddle with cute neon animals.
