Deku can use 100 percent in the manga, but it's usually a last resort or when he's facing an extremely powerful adversary. This power boost often has significant consequences for his body and abilities afterward.
I'm not sure of the precise percentage. Different people might have different estimates. It's best to keep up with the manga's ongoing chapters and see for yourself how far Deku's story has progressed.
It depends. Sometimes Deku can manage to use 100 percent without getting hurt if he has mastered certain techniques or has received special training. But usually, it comes with a risk of injury.
The percentage of Deku's power usage changes based on a lot of factors. Like the nature of the enemy, his training progress, and the urgency of the situation. So, it's hard to give a fixed percentage.
Another option is to check out dedicated My Hero Academia fan communities. Reddit, for example, has subreddits where fans share and discuss fanfiction. You could post a request there asking for Izuku 100% Full Cowl fanfictions, and chances are someone will be able to point you in the right direction.
Izuku is the central character. However, other characters from his class like Ochaco Uraraka could be important too. Maybe in this fanfiction, Ochaco teams up with Izuku during the entrance exam in a different way than in the original story. And of course, the pro - heroes who are overseeing the entrance exam are also likely to be main characters as they interact with Izuku while he's using his Full Cowl.
Well, perhaps in this fanfiction, Izuku's Full Cowl entrance exam includes him saving a group of students who were in a more dangerous situation than in the canon. This could lead to him getting extra recognition and making new friends early on. He might also face some challenges related to controlling his power at full strength during the high - stress exam environment.
The main differences are in their expressions and some minor details of personality. In the manga, Deku might seem a bit more intense, while in the anime, he's sometimes presented a bit softer.