Eggy: strong willed, can resist psychic attacks
Ove: Is a magician and has counter spells he could cast
Essy: Could sneak up on them, voiding the whole psychic ability in the first place
Edgy: even mild contact with Edgyhead's knowledge would kill them
Egga: same as Essy, but MUCH more efficient
Overseer: would kill them before they could even react