Definitely Snape. His complex character with his love for Lily and his role as a double agent has so much potential for exploration through memories. Harry himself is also interesting as his memories can uncover more about his family and his own growth. And Dumbledore, his past is full of mystery and his memories could reveal many secrets about his actions and motives.
Leonidas from '300' would be a great character to focus on. Imagine his reaction to the magic of the Harry Potter world. He's a fearless leader, and seeing him interact with wizards and magical creatures would be fascinating. He might see the magic as a new weapon or a strange form of sorcery that he has to either embrace or fight against.
Luna Lovegood is an interesting choice. She has such a unique perspective on the world, and in the post - war era, she could be involved in exploring the more hidden and strange aspects of the wizarding world that were overlooked during the war. Maybe she discovers new magical creatures or lost spells.
Bellatrix Lestrange is also really interesting. Her extreme loyalty to Voldemort and her wild, unpredictable nature can add a lot of drama to a fanfiction. You could explore her relationship with her family, especially her sister Narcissa, and how that influenced her actions. Another interesting villain is Draco Malfoy. While he's not a full - blown villain in the end, his struggle between following his family's dark legacy and doing the right thing can be a great focus for a fanfiction.
Harry Potter himself is a likely candidate. He has endured so much throughout his life, from the death of his parents to the constant battles against Voldemort. Fanfiction could explore his post - war trauma and how he tries to lead a normal life.
Definitely Harry Potter and Kim Possible themselves. Harry has his whole wizarding world experience and his fight against dark magic, and Kim has her crime - fighting skills and high - tech gadgets. Their different worlds and abilities would create a really interesting dynamic as they try to understand each other and work together.
Doctor Strange would be an interesting character to focus on in a Harry Potter MCU fanfiction. He already has knowledge of magic in the MCU, but it's a different kind of magic compared to that in Harry Potter. He could compare and contrast the two magics, and perhaps even learn new spells from the Harry Potter universe. His presence could also bridge the gap between the two universes in terms of magic.
Albus and Scorpius are extremely popular. Their friendship and the unique dynamic between them, with Albus being a Potter and Scorpius being a Malfoy, offers a lot of room for exploration. Writers can delve into their insecurities, how they support each other, and how they deal with the expectations placed on them because of their families.
Harry Potter is definitely one of the most popular. Since he is the main character in the original series, fans often like to give him a second chance in various scenarios. Hermione Granger is also popular as she is so intelligent and fans might want to see her make different choices with a second chance. Another popular character is Draco Malfoy. His complex character and his family's situation make him an interesting choice for a second - chance story.
James Potter is often a popular choice. He's the leader of the Marauders, a talented wizard, and his relationship with Lily Evans is a major draw. His transformation from a bit of a troublemaker to a more responsible person is also an interesting aspect to explore.
Harry Potter himself could be a likely focus. His status as the Boy Who Lived and his powerful magical abilities would make for an interesting reincarnation story. He could be reincarnated into the Bleach universe and become a powerful Soul Reaper or something unique within that world. Maybe he'd use his Gryffindor courage in new and different ways.