The Bonenoid are an enemy group introduced in Metal Slug Attack.
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The Bonenoid are fallen human soldiers whose bones were collected by Unsigned to serve as its army. There are two types of Bonenoids; those with shields who head to the front lines to take enemy attacks, and those with rifles who fire at the enemy.
Upon being sortied, Unsigned calls upon a trio of shield-using Bonenoids from the air. The remaining Bonenoids are summoned from underneath its robes, with 
2 allowing it to summon both rifle and shield-using Bonenoids at the same time; otherwise, it alternates between the two. While the summoning animation is short, Unsigned can be harmed and killed during the process.
Unsigned always summons the Bonenoids in groups of three. Each Bonenoid has their own individual health; when depleted, their head falls off, making them less effective in battle.
Conjuring the Bonenoids takes significant energy for Unsigned, who has to promptly recharge itself through a "dance" after summoning four groups of Bonenoids. During this "dance", Unsigned is completely vulnerable to attacks, often resulting in its death; however, should it manage to survive, it restores its energy to summon more Bonenoids.
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