A female vampire who takes Alvin under her wing and teaches him about the vampire world. She might have her own motives, like using Alvin for some grand plan in the vampire community.
There could be a vampire hunter who is after Alvin. This hunter might be an old acquaintance who now sees Alvin as a threat.
There could be the elder weremunk. This character would be very wise and have a lot of knowledge about the history and traditions of the weremunks. He could guide Alvin on his journey to becoming a weremunk. Another possible character is the rival weremunk. This one might not like Alvin joining their group and tries to cause trouble for him.
Maybe Alvin gets bitten by a vampire one night while walking alone. Then he starts to experience the changes like craving blood and having enhanced senses. He could struggle to come to terms with his new identity as a vampire.
Well, aside from Simon, Alvin is bound to be a central figure. He'd probably come up with all sorts of crazy plans to get Simon well again. Theodore too, as he's always been close to Simon. He might be the one to notice the small changes in Simon's condition first. And of course, Dave could also be an important character. He's like their guardian, so he'd be involved in taking care of Simon, getting him to the vet if needed, and making sure the other chipmunks don't get into too much trouble while trying to help.
I'm not certain as I haven't read it, but likely Alvin is one of the main characters since he is in the title. There could also be characters who are affected by Alvin's treachery, like friends or foes.
Well, clearly Alvin and Theodore are the main characters. Alvin is often the more outgoing and sometimes mischievous one. Theodore, on the other hand, is usually the more gentle and kind - hearted of the two.
The plot might involve Alvin being bitten by a weremunk by accident. As a result, he starts to transform into one. At first, he's scared and confused, but then he meets some friendly weremunks who help him understand his new identity. They teach him their ways, like how to hunt in the forest at night without getting caught and how to use his enhanced senses.
The main characters would be Alvin, Simon, and Theodore. Alvin would be leading the way in most of their high school escapades. Simon would be there to keep Alvin in check with his logical thinking. Theodore would be the heart of the group, always bringing a sense of warmth. Additionally, there might be a popular student in high school who becomes their rival at first but later becomes a friend. There could also be a school principal who has to deal with all the chaos that the chipmunks sometimes create.
Obviously, Alvin, Simon, and Theodore are the main stars. They are the ones who would be under the influence of hypnosis in this fanfic. There could also be other characters like Dave, their human caretaker, who might play a role in trying to break the hypnosis or dealing with the consequences of their hypnotized state.
In an 'Alvin and the Chipmunks' Alvin prison fanfic, Alvin could face a lot of difficulties at first. He is used to a life full of freedom and fun with his brothers. In prison, he might be lonely and scared. But as time passes, he could learn to adapt. He could teach the other inmates about music and harmony. His positive attitude could gradually change the prison culture. He might even find a way to communicate with his brothers outside, through secret messages or smuggled notes, and they could be working on a plan to get him out.
His depression could be shown through his behavior. He might stop being as energetic as he usually is. For instance, he won't be the first one to jump into a new adventure or come up with a crazy plan like before.