Mantis belongs to Kirihito Kamachi, a Mutant Quirk from the Vigilantes spinoff that appears to grant insect traits modeled on the praying mantis. Very little about its baseline form is confirmed, since it only surfaces after the Villain Factory and a dose of Trigger push it well past normal.
Mantis is a Mutant Quirk restricted to close range, held by Kirihito Kamachi. It first appears in Chapter 29 of Vigilantes and in Episode 13 of that adaptation.
Details on the untouched version of the power are thin. What can be inferred comes entirely from watching Kirihito operate while Trigger was in his system, which points toward abilities drawn from the praying mantis.

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Very little is confirmed about Mantis in its untouched state. What is known comes from watching Kirihito Kamachi under the effects of Trigger, when the Quirk swelled him into a humanoid mantis with claws honed to an extreme edge.
Kirihito Kamachi is the only known holder of the Mantis Quirk, a villain introduced in the Vigilantes spinoff.
The Mantis Quirk debuts in Chapter 29 of Vigilantes and Episode 13 of its anime adaptation.
The Villain Factory bio-engineered Kirihito Kamachi and combined the result with Trigger, amplifying his Mantis Quirk until it transformed him into a large humanoid mantis with dangerously sharp claws.
Mantis is classified as a Mutant Quirk that only functions at close range, with abilities that appear to be modeled on the praying mantis.
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