Midoriya would be a great candidate. He has a strong sense of determination and is always eager to learn. He would approach Pokemon training with the same enthusiasm he has for becoming a hero. He would study each Pokemon's strengths and weaknesses carefully and form strong bonds with his Pokemon through his kind and empathetic nature.
Honestly, it's really hard to determine the single longest Pokemon X Trainer fanfiction without extensive research. Some fanfictions might be hundreds of pages long. However, different platforms may host different lengths of such stories. You could start by looking at the most popular and highly rated ones on major fanfiction sites and check their lengths from there.
One great 'BNHA x male reader fanfiction' is 'My Hero Academia: A New Path'. It has an interesting plot where the male reader character has a unique quirk and his journey at UA is filled with challenges and friendships. Another is 'BNHA: Male Reader Insert - The Unseen Hero' which focuses on a male reader who has an underrated quirk but manages to shine in different situations.
I would recommend 'The Hidden Quirk'. In this 'bnha x reader fanfiction', the reader has a special quirk that has been hidden until now and it unfolds in an exciting way. 'A Hero's Heart' is also wonderful as it delves deep into the emotional side of the relationship between the reader and the BNHA characters. Additionally, 'Among the Heroes' gives a great perspective of the reader being part of the BNHA hero community.
There's also 'Pokemon Companions'. In this fanfiction, the male trainer discovers a special male Pokemon with whom he forms an unbreakable bond. The story is filled with their adventures, from battling in gyms to exploring hidden caves. It shows how their friendship grows over time.
One common theme is friendship. The male trainer forms strong friendships with his pokemon. Another theme is growth. He grows as a trainer, learning new strategies and becoming more confident.
One great male trainer x Pokemon fanfiction is 'A Trainer's Journey'. It focuses on a male trainer's growth and his special bond with his Pokemon. He faces various challenges and the story does a great job of portraying his emotions throughout the journey.
In some Pokemon novels, Blue is also considered a top - notch trainer. He is highly competitive and always striving to be the best. His strategic thinking and diverse Pokemon team make him a formidable opponent. He often challenges Red, which pushes both of them to improve and become better trainers.
One popular 'BNHA x OP Male Reader Fanfiction' is 'The One Piece Hero'. In this fic, the male reader from One Piece's world gets thrown into the BNHA universe and has to navigate the hero school system with his unique powers. It's really exciting as he uses his Haki in creative ways during battles against villains in the BNHA world.
One common theme is the struggle between good and evil within the relationship. Since Deku is a villain here, the reader often has to grapple with their own moral compass while being attracted to him.