Hello guys.So,here is some explanation and info about Izuku's Quirks.

1.One For All
-As you guys know,Izuku inherits OFA from All Might.This Quirk is the strength-enhancer type.

2.All For One
-Izuku still doesn't realize but she inherits this Quirk from All For One. She can take Quirks or give Quirks to other.
-Can stock many Quirks in her body.

3.Darkness
-Izuku inherits this Quirk from her mother.
-This Quirk has many function.
-Can be the strongest,sharpest,fastest,hardest weapon or shelter.
-Can be formed into many weapons such as katana,scythe,dagger,whip,spear,lancer and many more
-Can form into wings to fly at the fastest speed.
-Can be used to cover body(if she suddenly get naked during battle😂)

Negative effects

1.One For All
-You guys already knew if Izuku uses this Quirk to full power,she will break her bones

2.All For One
-No negative effect

3.Darkness
-This quirk is actually very dangerous and need a lot of focus.
-If Izuku uses this Quirk for too long,she will start feeling nauseous,coughing blood and her body become weak.
-If she experiences mentalbreakdown,the Quirk will be unstable and will control both Izuku's body and mind and go berserk! (Izuku will be unconscious during this time and it will be at full power)

So,I hope you guys understand better know.

Cya'!!!😜

~NanA~