The Mad Hatters are a four-piece rock band out of Naruhata, tapped to play the Marukane Department Store's live event. Skilled but untested at scale, they end up folded into FeatherHATS for the Naruhata Festival, the biggest stage any of them has stood on.
Four young men make up the group, which appears in Chapter 21 of My Hero Academia: Vigilantes and Episode 11 of its anime. The unnamed leader handles guitar and vocals, Daiki plays drums, Hiroto works the keyboard, and Akira takes bass. Yūki Shin voices the leader in Japanese, with Kieran Flitton in the English dub.
The band formed at some point before the story picks up and built a reputation as genuinely capable musicians, though nothing suggests they had ever played a show on the scale of Narufest. The Marukane Department Store called them in for its live event, which put them on the same bill as Pop☆Step, the duo Feathers, and East Naruhata High's dance squad. Rather than compete, the acts combined into a single unit called FeatherHATS, and the festival became their first major concert.
The leader gets a small subplot out of it, falling for the dance squad's captain from East Naruhata High during the run-up.
Betten Court's character notes reveal a design intent the manga never states outright. Through his clothing, the leader was meant to read as British, while Akira was styled to look American.

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The Mad Hatters are a four piece rock band from Naruhata who appear in My Hero Academia: Vigilantes, made up of an unnamed leader on guitar and vocals, Daiki on drums, Hiroto on keyboard, and Akira on bass.
The Mad Hatters were booked by the Marukane Department Store for a live event alongside Pop Step, and the two acts merged with the duo Feathers and East Naruhata High's dance squad into a single group called FeatherHATS.
Narufest is the Marukane Department Store's rooftop concert where the Mad Hatters, performing as part of FeatherHATS, played the biggest show of their career.
Yes, the unnamed leader of the Mad Hatters develops feelings for the captain of East Naruhata High's dance squad during the lead up to the Narufest performance.
The Mad Hatters' leader is voiced by Yuki Shin in Japanese and Kieran Flitton in the English dub.
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