Someone in the book told me how they didn't know what quirk to have since I seem to always mention the reader having a quirk so to help you out here is some quirk ideas (thought of them myself actually)

Cyber/ virus/ glitch/ code/still trying to think of a name for it

You are connected to anything involving technology like wires, computers, machines, you get the gist. This makes you veins work like wired

Weakness- water

Drawback: if you use your quirk to much you overheat and you sweat. You might even pass out from overheating yourself or throw up

Widow/ spider

You have spider eyes (8 eyes) and spider legs on your back, your fangs contain this thing called neurotoxic making it so that when you bite someone you poison them.

Weakness- just like spiders your weak points are your spider leg joints, like spiders you can't breath as well as humans can

Drawback- you can't talk to spiders or have a spider army 😂

Edit:
You can put your spider legs into your back since it's probably tiring to have them out and keeping them up for the day (usually you just keep them resting on your shoulders and waist) but if you put them back into your back they show through your skin (like how your spine sticks out your back but doesn't take off your skin) but when you bring them back out it's painful and you will most likely bleed

Like this (don't ask)
You could also hide your multiple eyes by them hiding under your skin but in order for them to come back out they need to cut through your muscle and skin aka making you bleed.

That is a drawback so normally to avoid it you keep your legs and eyes out, you were these goggles some inventors made to help see and usually you just rest your spider legs in the outside of your shoulder and the outside of your waist

4 elements

You have the 4 elements of the worlds

Water
Earth
Fire
Wind

Water- 15 minutes
Earth- 20
Fire- 10
Wind- 15

Weakness- certain power have different side effects.
Water- dehydrated
Earth- dizzy
Fire- make you overheat and pass out
Wind- makes it hard to breath

Drawback- you can only use one at a time

Blood manipulation-

You can move another persons ( or your own) blood however you want

So you can make someone pass out from blood loss, make a certain body part have no blood, make someone cough out blood, you get it

Weakness- is used to much you start to have blood fall out your mouth

Drawback- you don't have one

Time

You can control time at your will, pause time, reverse time, your basically Max from life is strange. And no a big storm is not gonna come if you use it too much

Weakness- your nose starts to bleed if you use it too much

Drawback- you can't go to the future

Storm

You can control the weather basically

Weakness- you get dizzy when using it too much

Drawback- it has to be the current weather or another weather near Japan (UA is in Japan) so you can't just bring up hail out of nowhere on a nice hot day

Bunny

Your a fucking bunny, need I say more? You have bunny ears, bunny nose and a bunny tail, and no your not a stripper

You can jump really high, you have good sent, you can squeak, you are adorable, you can hear well, you have all the qualities (except physical, aside from the ears, tail and nose) you are a bunny

Weakness- don't have one

Drawback- you can't do what a frog can do, you can't be tsu

Demon

You can turn into a demon when you want

You grow horns, get a tail, some fangs, wings (if you want), and a snake like tongue.

Weakness- you can't be around a bible or a cross

Drawback- it hurts your head, your lower half, your tongue and your back when you transform.

Slime

You can turn your body into slime, you can still move, and you can command any part of your body whenever you want

Weakness- you can't be around water or anything that can hurt slime

Drawback- it looks freaky when you transform and detransform.

Touch

When you touch someone any part of the body you touch turns inside out.

Weakness- you start to bleed when you use it too much

Drawback- you can't do it to their whole body

Chemical reaction

Your body can get any chemical (it doesn't harm you even if it should) and start a chemical reaction. Like explosions, fires, ice, anything like that.

Weakness- if the chemical is meant to hurt the human body it makes you have a bloody nose

Drawback- you don't have one