Armothy

 is a non-playable character in MultiVersus.

Origin
Armothy is a gigantic, sentient arm acquired by Morty in the second episode of the third season of Rick and Morty, "Rickmancing the Stone". He is the muscle memory of a deceased woodcutter who lived in the Post-Apocalyptic Dimension.

Role in MultiVersus
Armothy manifests itself during several of Morty's standard attacks.

External

 * Armothy on Rick and Morty Wiki.