This page is for characters who debuted in Metal Slug Defense
- The main Metal Slug cast can be found here.
- Those introduced in Metal Slug Attack can be found here.
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A mechanic of the Regular Army. She hosts the Build Up section in Attack.
- Ascended Extra: In Defense, Eris only appears in the POW list and Relief Supplies menu. In Attack, she's been given a set of sprites and appears in the main menu.
- Bare Your Midriff
- Dark-Skinned Blonde
- Remember the New Guy?: Shows up without any sort of fanfare in Defense. She makes her presence better in Attack.
- Spot the Imposter: A computer player (name: cpu) in Battle and Team Battle has Eris as their avatar. They also have zero wins.
- Wrench Wench: A mechanic. She appears in unit and deck building menus.
A group of odd-looking Cats who have a will for world domination. Part of a cross-promotional event with PONOS' The Battle Cats.
Battle Cats tropes:
- Cats Are Mean: As in their home game.
- Dirty Coward: As opposed to the other units which have a powerful attack for their special move, Gross Cat simply skitters away from the enemies.
- Enemy Mine: In a sense, as one of the members is Teacher Bun Bun, who acts as an incredibly hard boss in his home game.
- Face Plant: The wall cat's method of attacking.
- Guest Fighter: Brought by Morden when he tried to bring the Kraken to the present, and again when Morden crash landed in the Battle Cats universe.
- Mighty Glacier: Both the regular and black Titan Cats have slow movement and attack speed, but very high stats.
- Mook Maker: A fridge can be placed to produce basic cats.
- Mix-and-Match Weapon: The Iron Nokameow, which is a blue Iron Nokana (with treads instead of wheels) and a Cat Base on top.
- Palette Swap: Black versions of the five standard cats exists, differing by attack patterns and altered stats.
- Suicide Attack: The Cat Slug's special attack.
King of Fighters Team
The cast of The King of Fighters '94 rendered into Metal Slug units.
- Cast Herd: Whip and Heidern are part of the Ikari Warriors (residing in the Regular Army), but they are placed alongside the KOF Team. Both are then added to the Regular Army faction in Attack as the KOF team doesn't exist in that game.
- Dummied Out: Most of the fighters are present in Attack's data as filler. Over time, they are replaced by new original characters.
- HeelFace Turn: Gameplay variant. The fighters originally each sided with the Regular Army or the Rebellion. After enough fighters were added, they were all moved to a new faction for themselves.
- "Pop!" Goes the Human: Chang's defeat animation is him popping out.
A group of characters that look and behave to Hyakutaro.Originally there was only one in Defense called Issenmantaro, also known as 10000000TARO; he appeared as part the game's ten million download campaign.Many other Taros have shown up in Attack also as part of the game's respective download milestones.
- Close-Range Combatant: The red-haired variant. The rest shoot energy beams.
- Crutch Character: Although he becomes useless pretty quick into the game.
- Dub Name Change: Their Japanese names are written out in their native language. Internationally, they are simply named [number]TARO.
- Meaningful Name: Each are named after the number of downloads Defense and Attack got.
- Meaningful Rename: His Attack version is named for the same reason, if he is the same one as in Defense.
- Palette Swap: To Hyakutaro.