Glycerin is the Mutant-type ability of Mitsuki Bakugo, which secretes a smooth liquid through her skin. Unremarkable on its own terms, it matters enormously in combination, since crossing it with her husband's power produced the Explosion Quirk their son wields.
Glycerin is a contact-range Mutant power belonging to Mitsuki Bakugo. It has no combat application of note and no recorded debut, and its significance rests almost entirely on what it becomes when inherited alongside another ability.
The power draws a smooth liquid out through the user's skin. Its observable effect is cosmetic: the secretion moisturizes constantly, giving Mitsuki flawless skin quality and preserving a youthful look well past what her age would suggest.
Genetics are where it counts. Combined with Masaru Bakugo's Acid Sweat, the two abilities yield Explosion.

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Katsuki Bakugo does not carry the Glycerin Quirk himself. It belongs to his mother, Mitsuki Bakugo, and combined with his father's Acid Sweat to produce the Explosion Quirk that Katsuki actually wields.
Mitsuki Bakugo's Quirk is called Glycerin, a Mutant-type ability that secretes a smooth liquid through her skin.
Glycerin draws a smooth liquid out through Mitsuki Bakugo's skin, which moisturizes constantly and gives her flawless, youthful-looking skin, though it has no notable combat use on its own.
Mitsuki Bakugo's Glycerin combined genetically with Masaru Bakugo's Acid Sweat, and that pairing produced the Explosion Quirk their son Katsuki inherited.
Mitsuki Bakugo is the only known holder of the Glycerin Quirk in My Hero Academia.
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