so I came up with some random quirk ideas for izuku a while ago and just remembered them so here they are
Heartstring shredder
When the user plays a note on a string instrument it produces a sound wave that can deal physical damage to a target low notes are blunt while high notes act more like a bullet or arrow and medium notes will be more blade-like
Time speedster
The user can speed up or slow down there own time and the time of others namely making himself extremely fast or slowing down his own perception of time to react quicker
Velocity
The user can increase the velocity of things around them making them faster or slower however overuse can cause headaches and exhaustion
Hammerspace
The user can open portals to a special space that fallows them and the user can even enter it to effectively teleport however overuse causes nausea and headaches as well it has a size limit
Boomerang
Anything the user throws will return to them