Obviously, Prof Oak would be one of the main characters. And perhaps a young trainer who is helping Prof Oak in his research related to the blue 39 thing. It could be a trainer who has a special bond with a certain type of Pokemon that is somehow related to the mystery.
There's also a chance that Dumbledore gets caught by a group of rogue magical creatures. For instance, if he was exploring an area that was supposed to be off - limits to wizards and the creatures there saw him as an intruder. They might not be as rational as wizards and could hold him captive without really understanding who he is.
It could be Severus Snape. He has a complex relationship with Dumbledore. Maybe Snape discovers some of Dumbledore's plans that he doesn't agree with regarding Harry Potter. He then sends a Howler in a fit of anger to express his disapproval.
Fred and George Weasley are very likely candidates. They are known for their love of pranks and their mischievous nature. They might see pranking Dumbledore as the ultimate challenge.
I'm sorry, I don't have specific information about 'Prof Saibaba' at hand. There could be many professors with this name. You can provide more context like his field of study, the university he is associated with, etc. to help me give a more detailed story.
I'm not entirely sure as 'chem prof fanfic' could be about a lot of things. It might be a fanfiction related to a chemistry professor. Maybe it's a story where the author creates fictional scenarios involving a chemistry teacher, like their adventures in the lab or their relationships with students in a made - up, fictionalized way.
Since I haven't read the fanfic, I can only guess. Obviously, Professor Oak would be one of the main characters as the title implies. There might be a young trainer who has a connection to either blue or green Pokémon (maybe they specialize in water or grass types) and is the one who has to decide whether to forgive Prof Oak.
The title 'Blue or Blue Forgive Prof Oak' clearly points to Blue and Professor Oak as main characters. Blue could be a young and ambitious character, perhaps a trainer. Professor Oak, on the other hand, is an older, wiser figure. In the fanfic, their relationship is likely to be at the core. There may be side characters that support or oppose their actions, but Blue and Oak are the ones that the plot will mostly revolve around.
The Ministry of Magic could be responsible. They might be jealous of Dumbledore's power and popularity. They could see him as a threat to their own authority and come up with some false charges to arrest him. For example, they could claim he was hiding information about a dangerous dark wizard.
Snape can be a prominent character. Given his complex relationship with Dumbledore and Harry, his perspective could add a lot to the story. He might have some insights into Dumbledore's actions that Harry doesn't know about, and his reactions to Harry's blaming could vary from being scornful to having a moment of understanding. Luna Lovegood could also be a part of it. Her unique view of the world might make her offer some different viewpoints on the situation between Harry and Dumbledore.