Ido is a new character introduced in Metal Slug Attack.
Ido is a woman with mysterious origins, but she has interest in Ptolemaios for reasons unknown.
In battle, she uses a pair of magically-imbued daggers that are filled with curse magic, weakening opponents who are struck by her attacks.
First appearing in "Burning Diamond", Ido somehow ends up getting lost and falls unconscious in front of a mine. She is resuscitated by Maya, who gives her food and drink to recuperate. Ido thanks Maya and learning that she has been sent to the mine to help extract ore for her employer, vows to help her out of gratitude. During the operation, they are attacked by Martians, but Ido's cursed daggers destroy the Mars Wolf and nearly overwhelms them until Bonny teleports them away. After their departure, Ido gives Maya a chunk of ore, who headpats her in response, much to her embarassment.