Good Ear is the Mutant-type ability of the Pro Hero Sirius, tuning her hearing to frequencies beyond what human ears register. Introduced in the anime rather than the manga, it serves her mainly as a long-distance communication line and a headcount tool during operations.
Good Ear is an anime-original Mutant power belonging to Sirius, classified for long-range use. It contributes nothing offensive, working instead as a support ability built around perception and coordination.
The power stretches the user's hearing into high frequencies that ordinary ears cannot detect. That extended range doubles as a channel, letting Sirius stay in contact with Selkie across distances that would otherwise separate them.
It also serves as a rough sensor. By listening alone, she can determine how many people are in the surrounding area, which makes the ability useful for reconnaissance.

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Sirius is the Pro Hero in My Hero Academia known for the Good Ear Quirk, which extends her hearing into high frequencies ordinary human ears cannot detect.
Sirius's Quirk is called Good Ear, a Mutant-type ability introduced in the anime that lets her hear far beyond the normal human range.
Sirius uses Good Ear to stay in long-distance contact with her partner Selkie and to determine how many people are in a surrounding area just by listening, making it useful for reconnaissance.
Good Ear is an anime-original Quirk with no counterpart in the My Hero Academia manga, first appearing in Episode 32.
No, Good Ear contributes nothing offensive. It functions purely as a support ability built around perception and coordination with Sirius's partner, Selkie.
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