Ichigo is often a popular choice. Since he's the main character in the original 'Bleach', many fanfic writers like to explore more of his potential in a second chance scenario. He could further develop his powers or fix some of the mistakes he made in the original story.
Rukia is also quite popular. Her relationship with Ichigo and her own backstory offer a lot of room for exploration in a second chance fanfic. Writers might give her new opportunities to grow, or change the way she interacts with other characters based on a different set of circumstances.
Harry Potter himself is often a popular character in these fanfics. After all, the idea of him having a second chance at things is very appealing. Hermione is also popular as she could use her intelligence in different ways with a second chance. And Draco Malfoy is quite popular too. People like to explore his character getting a second chance to break free from his family's expectations and become a better person.
The antagonists in 'bleach the gamer fanfic' can also be popular. If they are written in a way that challenges the gamer character's skills and strategies, they become memorable. Maybe an antagonist who can also adapt to the gamer - like tactics of the main character, creating a tense and exciting back - and - forth in the story.
Rukia is also popular. Her connection to Ichigo and her own unique powers and backstory can be explored in new and exciting ways in reincarnation fanfics. For example, she might be reincarnated in a different part of the Soul Society with a new role to play.
Rukia can also be quite popular. Her connection to Ichigo and her own experiences in the Bleach universe can be interestingly explored in relation to hollowfication in fanfics. For example, how she might react to Ichigo's further hollowfication or if she were to face the threat of hollowfication herself.
Sasuke is also very popular. Fans love to explore what would happen if he had a second chance to redeem himself or make different choices regarding his path of revenge. He has a complex character, and in these fanfictions, there are a lot of possibilities for his development.
Sonny Munroe is obviously a very popular character to feature as she is the main character. Chad Dylan Cooper is also quite popular as he is the love interest and the rival from Mackenzie Falls. Then there's Zora, with her unique personality and quirks. Fans love to write about her adventures and how she interacts with the other characters on the set of So Random!
Ichigo is often a popular character in 'bleach high school fanfic'. His strong personality and dual life as a student and a Soul Reaper make him an interesting focus. Rukia is also popular as she brings the cool and mysterious element from the original series into the high school setting.
Sasuke can also be a very popular character. His complex personality and powerful jutsu can create interesting storylines in the 'naruto godlike bleach fanfic' world. He might have some sort of power - up or new relationships with Bleach characters. Also, characters like Rukia are popular as well. Her cool and calm demeanor along with her strong Soul Reaper abilities can make for great interactions with Naruto characters.
Naruto himself is, of course, the most popular character to feature. After all, it's his second chance at life and time travel. Sasuke is also very popular. His complex relationship with Naruto can be explored in new and interesting ways in a time - travel scenario. Kakashi is another one. His role as a mentor can be expanded upon, especially if Naruto has knowledge from the future that he can share with Kakashi. Hinata is often included as well. Her unrequited love for Naruto can be developed further, and perhaps in the time - travel plot, she can play a more important role in Naruto's life earlier on.
In addition to the main couples, Techno is a character that can be a focus. He's such a fun and relatable character. Fanfics could center around his friendships with the others, or even a love interest for him that we didn't see much in the series.