Fedeln Metzelei is a new unit introduced in Metal Slug Attack. He debuts in the “Butterfly of Disaster” Extra Ops.
Fedeln is a humanoid butterfly affiliated with the Invaders. He is the second of the Metzelei Four. He has extremely potent poison, which is capable of melting through poison-resistant body suits and masks. Unfortunately, it is uncontrollable, and its random blasts of poison have an enormous radius. As a safety measure, Fedeln is closed off from his fellow Invaders, and thus lives a lonely life as a result. He is gentle although somewhat looney due to his isolation.
Fedeln first appears in "Butterfly Disaster", where he is paired with Nowan on a mission to Earth. During the confrontation with the Ptolemaic troops, Caroline shoots an unknown bullet at Fedeln’s wings. As if a miracle, it stopped his wings from seeping poison. Fedeln then happily puts himself on open fire. Nowan begrudgingly intervenes as she doesn’t want to be scolded by Annette for letting a vital member of their army die, and covers their escape with multiple fissions. At space, Fedeln asks Nowan to accompany him to Earth again, which they flatly refuse, causing him to remark that they are cruel.
He later appears in "Try Line 2nd" where he, along with Schwarz accompany the Great Mother into a battle between the Rebel Army and Martians. After the Great Mother is wounded, Fedeln remarks that he wants to hug her, but Schwarz states that she doesn't like him. Fedeln then tries to hug Schwarz, only to have her run off.
In "United Front the 8th", Fedeln approaches Schwarz and Franke after the latter wants the former to accompany her to Earth to collect more test subjects. He accidentally subjects Franke to some of his poisonous scales, and after steadying himself, convinces Schwarz to tag with Franke after telling her that their leader learned of a new golden unit and requested samples from it. When the two leave, he giggles, suggesting that he had his own reasons for approaching them.
He makes a small appearance in the "Fall of Disaster" story where Schwarz calls him for a ship, but he gives her a sob story instead.
- Fedeln Metzelei is the second male Space Army character to be introduced since the Professor's debut.
- He is the second Metzelei to be introduced.