Really Late Update: So Olivier Hague fixed the Japanese Wikipedia pages for the Legacy of Goku games, so all of this is no longer true. It was funny while it lasted, though.
So I was looking up fusion rules on the Japanese Wikipedia's DragonBall pages because of the thread that's in the "DragonBall Questions?" forum right now, and I noticed it said that "Gotan", the hypothetical fusion of Goku and Mister Satan, was a playable character in Buu's Fury (it also mentioned that Gotan is playable in Budokai 2, which I believe is true). Now, I've played through Buu's Fury about a zillion times and unlocked everything repeatedly, and I'd never heard of that, so I went to the page they had for Buu's Fury for more information. It turns out their page describes a completely unlike the actual game. At first I thought this was due to regional differences, but as far as I can tell Buu's Fury was never released in Japan (the page itself describes the game as one sold overseas). Not to mention much of the stuff is says sound like obvious lies, but I'm getting ahead of myself.
Basically, it says that Buu's Fury is composed of multiple possible routes, and that the game's story changes dramatically based on what you do. What's more, there's an alternate mode called "Other World" set in Future Trunks' timeline where you play as him. It says that aside from King Gurumes, practically all of the movie villians appear. Sadly, the real Buu's Fury isn't quite that awesome.
Some things it says are supposed to happen in this game, if you take the right route:
- Goku can fuse with Satan to form Gotan, be defeated by Buu, but still end up revered as a hero, similiar to what happened with Satan and Cell (it doesn't say how or if Buu actually gets defeated by anyone).
Goku can fuse with Videl (?!) to form Godel. They never return to normal, and Godel marries Gohan (?!?!?!?!?!).
In the "Other World" mode, Vegeta goes Super Saiyan 3 against Broli.
Freeza is revived by Janenba and attacks Gohan, like in DBZ movie 12, often with the Ginyu Special-Squad in tow. In some routes, Freeza will still be alive and try to get revenge on Goku, only to give up when he recognizes Goku's superior strength. He then just keeps training to try and surpass Goku. If this happens, he will be an NPC during the battle with the Bio Warriors, and fight on Trunks and Goten's side. In other routes he will be revived as a Bio Freeza, together with Bio Cell.
Cell will also sometimes be revived by Janenba's power, and be stronger due to training in the afterlife. He'll give Gotenks a tough fight, but be seized by the reformed Dabra and taken back to the afterlife.
Majin Buu can reform into Mister Buu and battle Janenba. In some routes Mister Buu and Satan can team up to defeat the skinny Buu.
Coola can be revived by Janenba, at which point you fight him as Mister Satan (?). Naturally this is a hard fight, but if you fulfil certain requirements and still lose, Freeza will defeat Coola.
Turles is mistaken for Goku by Broli, then ends up becoming Broli's underling, but is defeated by Super Saiyan 2 Vegeta, and then revived by Janenba.