Male anons with an over-the-top punk appearance (notably sporting the titular mohawk hairstyle) who's only job in life is to abuse, kill or just simply bully yukkuris, both nicheads and scums, for a living. Ironically they're often shown to be very nice and kind when interacting with anything that isn't a yukkuri.
Comedically it's sometimes shown that when an anon turns into an abyuser, their hair spontaneously turn into a mohawk