It's possible he gains enhanced physical abilities like super strength or speed. Since his heritage is often tied to some special genetic traits, these could be unlocked upon the revelation. For example, if his heritage is linked to a powerful clan, he could inherit their natural combat prowess. He could also find out about special chakra control abilities that are exclusive to his bloodline, which would give him an edge in battles.
I'd recommend 'The Wheel of Time' series by Robert Jordan. The main character, Rand al'Thor, starts to uncover and master his immense powers throughout the series. It's a rich and detailed world with lots of power discovery and growth.
It was a novel called " Resurrection." The main character found that his dead teacher had suddenly returned and found that his mother was a monster in human skin.
There was a girl named Lily. One day, while she was in the garden, she noticed that she could make the flowers change colors just by thinking about it. At first, she thought it was a fluke, but when she tried it again on a different flower, it worked. Lily was both excited and a little scared. She didn't know where these powers came from. She decided to keep it a secret and experiment in private. She found that she could also move small objects with her mind. One time, when she was in her room, she made a pencil float in the air. As she explored her powers more, she realized she could create a small shield of light around herself. She started to use her powers to help others secretly. For example, she helped an old lady cross the street by using her power to stop the cars for a moment. But as her powers grew, she knew she couldn't keep it a secret forever. She had to figure out how to control them fully and use them for good in a more open way.
Obviously, Harry Potter himself is a main character. He is the one on the journey of discovering his heritage. There might also be Hermione Granger as she often helps Harry in his adventures and could be crucial in this discovery too.
Another way Ichigo could get his powers back in fanfiction is through a magical or spiritual artifact. Maybe he discovers an ancient sword or a talisman that has the ability to restore his lost powers. This could be part of a grander plot where he has to go on a quest to find this item, facing various challenges and enemies along the way. During this journey, he might also learn more about the true nature of his powers and how they are connected to the overall 'Bleach' universe.
This kind of plot often appeared in online novels. The male protagonist found out that his family was a billionaire and his inheritance was stolen by an unknown person. The male protagonist began to search for the truth and used various means to protect himself and his family.
This kind of plot often appeared in novels or television dramas, sometimes involving law, politics, business and other fields. The male protagonist often encountered various challenges and difficulties, but he always overcame them to find the truth and finally win.
Of course, this kind of plot would not appear in all novels. Different novels would have different plot designs, and the male protagonist would face different challenges and difficulties.
One interesting plot could be Naruto finding out about his mother's clan and their unique abilities. Maybe he discovers a hidden jutsu passed down in her family that he can then learn and use to his advantage in battles.
In addition to the main characters related to Naruto directly, some fanfictions might include other village elders or shinobi who knew about the Uzumaki clan's past. For instance, an old ninja who was friends with Kushina's parents could surface with crucial information about Naruto's heritage. There could also be antagonists who are interested in Naruto's newly discovered heritage for their own evil plans.