In certain 'Bleach Ichigo Betrayed' fanfictions, Captain Aizen could still be a key figure in Ichigo's betrayal. Even though his main arc in the original series is over, in fan - made stories, he could have left behind some sort of contingency plan. There could be some hidden influence he has on the Soul Society or on Ichigo's friends that leads to Ichigo being betrayed. Another character could be Gin. He was always a bit of an enigma in the original series, and in fanfics, he could be resurrected or have some long - term plan that involves betraying Ichigo for his own, or someone else's, gain.
One character that might betray Ichigo is Chad. In some fanfic scenarios, if Chad is corrupted by some dark force or if he discovers some 'truth' about Ichigo that he believes is a threat to the world, he could turn on him. Also, Orihime has the potential to be a betrayer in fanfictions. If she is brainwashed by an enemy, like a powerful Hollow or an evil Quincy, she could be made to act against Ichigo. Her powers are unique and if misused, could cause a lot of harm to Ichigo.
Uryu could be another supporter. Despite their differences in the past, Uryu has come to respect Ichigo. In this strange situation, he might use his intelligence to help Ichigo. For example, he could research any possible side - effects or solutions related to the mpreg. Orihime is also a strong candidate. She has feelings for Ichigo and would be very empathetic. She would likely offer her healing powers and motherly - like care to Ichigo during his pregnancy.
Well, sometimes in these fanfics, Ichigo is betrayed by his Hollow side. It could be that the Hollow part of him has its own agenda and decides to use Ichigo's friends as bait to draw out more powerful opponents. This would make Ichigo feel extremely guilty as he's the one who brought this danger to his friends. Also, there could be a plot twist where Ichigo is betrayed by a new character introduced in the fanfic. This new character might have pretended to be his ally all along but was actually working for a powerful antagonist. This would make Ichigo realize that he can't trust people so easily.
There could be Byakuya. He would be shocked and disappointed by female Ichigo's betrayal as he might have seen her as a promising comrade. Also, Rukia. Since she and Ichigo have a special bond, her reaction to Ichigo's betrayal would be very emotional. And then there's Aizen. He could be the one who tempted or manipulated female Ichigo into betraying, seeing her as a useful pawn in his grand schemes.
Even Ginny could be written as a betrayer in a fanfic. For example, if she becomes possessed by a dark force, she might turn against Harry. Her relationship with Harry is so central in the original story that a betrayal from her would be a huge shock and create a lot of drama in the fanfic.
Ichigo would probably be devastated. His trust in relationships would be severely shaken. He might become more withdrawn and focus even more on his battles and training, using it as an escape from the pain of the betrayal. He could also become more cynical about love and people in general.
One popular character paired with Ichigo is Naruto. Their different power sets and personalities make for an interesting combination. Naruto's positive and determined attitude could contrast with Ichigo's sometimes brooding nature. Another is Luffy from 'One Piece'. Luffy's carefree and adventurous spirit next to Ichigo's more serious approach to protecting his friends can create some great stories.
Luke could be a likely candidate in some fanfictions. He already had his own issues and motives in the original story, and it wouldn't be a stretch for a fanfiction writer to take that further and have him betray Percy in a more elaborate way.
There's a fanfic called 'The Bond of Hearts'. It's set in an alternate universe where Ichigo and Orihime are childhood friends. It shows their relationship evolving over the years. It delves deep into their emotions and how they gradually realize their love for each other. The character development in this fanfic is quite engaging.
In 'harry potter is betrayed fanfic', Luna Lovegood might be a character who betrays Harry. Maybe she is under the control of some mind - altering spell or has been deceived by a false prophecy that makes her think she is doing the right thing by betraying him. Also, Hagrid could be a shock betrayer if he is somehow forced to choose between Harry and his beloved magical creatures, and chooses the latter in a way that is seen as a betrayal to Harry.
Orihime Inoue is often included in Ichigo's harem in fanfics. She has a pre - existing relationship with Ichigo in the original series, with her feelings for him being quite strong. Rukia Kuchiki is another common character. Her connection with Ichigo is deep, as she was the one who initially transferred her powers to him. Then there's Tatsuki Arisawa, who is Ichigo's childhood friend. In some fanfics, her relationship with Ichigo takes on a more romantic turn within the context of the harem. And Neliel Tu Odelschwanck could also be part of the harem. She has a unique bond with Ichigo, and her character's personality makes her an interesting addition to the harem concept.