He was portrayed by Jimmy Urine.
Halfnut was a member of the Yondu Ravager Clan. During their stay at the planet Contraxia, Halfnut witnessed the arriving Sovereign High Priestess Ayesha as she offered them a reward for the capture of the Guardians of the Galaxy for the theft of the Anulax Batteries.
Halfnut went with the other Ravagers onto Berhert, where they manage to capture Rocket Raccoon and Groot as the other Guardians were being transported into the planet Ego. However, Rocket offered a deal to the Ravagers: he'll give them the batteries in exchange for his and Groot's safety, to which Yondu accepted by warning that killing the Guardians would put the entire Ravager clan in trouble with the Nova Corps. Though several Ravagers obliged to Rocket's deal, Halfnut was among the several Ravagers who refused to accept this, which incited the greedy Taserface to lead a mutiny against Yondu and his followers, even after Yondu and Rocket are knocked out by a freed Nebula.
With Taserface taking over as the new leader of the Ravagers, Halfnut joyfully took part in humiliating Yondu and Rocket, as well as helping out Brahl in executing the Ravagers who remained loyal to Yondu by sending them out through the airlock. However, Yondu's first mate Kraglin Obfonteri freed the captives, allowing Yondu and Rocket to finish off the mutineers as revenge for their treachery. Halfnut was killed when Yondu used his arrow to slice him in the chest.