One common theme is isolation. When Harry loses everything, he often finds himself alone, cut off from the friends and the world he once knew. Another theme is despair. Losing everything makes him question his existence and purpose. For example, in many such fics, he might wonder why he should keep fighting when he has lost so much.
Well, in the 'harry loses everything fanfiction' like 'Harry's Shattered Existence', he loses his mentors one by one. Dumbledore is killed in a different way and Sirius never gets a chance to be there for him. Also, 'Desolate Harry' is a fic where he loses his sense of purpose. He is left with nothing but his own doubts and the ruins of what could have been a great life.
One great anime is 'Sword Art Online'. The main character, Kirito, is extremely overpowered (OP). He is highly skilled in the virtual reality world of SAO. In the series, he also has a love story with Asuna. Their relationship develops as they face various challenges together in the dangerous game world.
In this kind of fanfiction, Goku might lose his family. For example, his friends and loved ones could be killed by a powerful new enemy. This would leave him in a state of deep despair and loneliness, and he would have to find a way to carry on without them.
One good anime is 'Sword Art Online'. The main character, Kirito, is extremely overpowered. He's highly skilled in combat within the virtual world of SAO. And there's a love story between him and Asuna. Their relationship develops as they face various challenges in the game world.
Fullmetal Alchemist: Brotherhood. Edward Elric is a very capable alchemist. The story is about the brothers' journey to find the Philosopher's Stone to restore their bodies. It has a great blend of action, mystery, and moral lessons, with a well - crafted world and engaging characters.
A very popular one is 'One Piece'. Luffy is the OP MC. While the love story aspect isn't as central as in some other anime, his relationship with Boa Hancock has elements of a love story. Hancock is in love with Luffy and it adds an interesting dynamic to the story, especially considering Luffy's rather oblivious nature to her feelings.