Considering everything I know about each fusion and the battle conditions under which the battle would take place, it would go like this:
Phase 1: The first 15 minutes of preparation.
- I don't know Gajou and Golden of U well enough to say what they would do with information about someone on the enemy side having some level of AP, Dura and Lifting Strength Amplification and durability negation, other than the fact that Golden of U possibly bring various objects to life and form an army, I also don't know if they are willing to share information with each other to help with planning.
- With prior knowledge of the skills AP and Lifting Strength Amplification, GBR, Nuclear Fission Fist, BFR via Portal, Time Travel, All properties of Cursed Energy, all information about Gojo domain expansion, Sense Manipulation, Infinite Death Loop, Sealing and BFR (From Coco Jumbo), the duo Garisk and Pink Witch would be extremely concerned about the capabilities of their opponents and the high social and strategic capacity of both fusions would encourage both to share information about their capabilities to create an appropriate combat plan, thus Pink Witch would know of Garisk's temporal resurrection and ability to reset and would use this to gather long-term information from his opponents if necessary.
- So Pink Witch with her animal manipulation and life manipulation would create a mixed army of Grimms and living plants to distract her opponents and she would abuse her light cannon and warship to give an initial advantage in the first confrontation.
Phase 2: The start of the battle
- As both sides have some excellent tracking capabilities the conflict would not take long, even though no one knows what each other's starting positions are in.
- Gajou would use his portals to cross the distance instantly, and considering that with Gajou's great self-confidence, arrogance and bloodlust it is quite possible that he would try to defeat his opponents alone, which would result in him being surrounded by a ridiculous amount of enemies with equal status. and the constant bombardment of the light cannon and the battleship, leaving Golden of U behind to cross the distance and come to their aid.
- It is at this point that Pink Witch and Garisk begin to learn about Gajou's abilities, with Garisk using his information analysis to learn the most useful information about Gajou, including his relationship with Tareo, enough for social influence to be used.
- I see Gajou getting irritated by the ridiculous amount of enemies and would probably use his Nuclear Fission Fist and GBR to clear the ridiculous amount of enemies, but since Golden of U is within the range of both abilities, the passive causality manipulation of the another fusion would reverse Gajou's attacks, possibly irritating him, it is probably at this point that he decides to try to ignore the army and fly straight to the warship, I don't know if he would enter or if he would try to destroy the ship, but this would inevitably make him enter in conflict with Garisk and Pink Witch who would be quickly overcome and Garisk would probably die activating his temporal resurrection.
- Garisk would go back in time with his memories of his last battle and with some of Gajou's moves memorized and learned, which would help him adapt to the next fight, and with the information acquired, while Gajou faced the army he would share the information about his battle with Pink Witch and so the duo would begin to adjust their strategy, in addition to discovering that infinite death looping is a Golden of U ability, by process of elimination.
- The cycle would repeat itself a few times, with Garisk acquiring more and more information and surviving longer and longer.
Part 3: The means of struggle and its possibilities
This is where things get more far-fetched.
- Eventually Golden of U and his army arrive, with both armies beginning to kill each other and Golden of U trapping several plant beings and grimms in infinite death loops and joining Gajou in the fight, who by this time of the championship has already been targeted by the Garisk's sleep manipulation and resisted said ability.
- Eventually Golden of U and his army arrive, with both armies beginning to kill each other and Golden of U trapping several plant beings and grimms in infinite death loops and joining Gajou in the fight, who by this time of the championship has already been targeted by the Garisk's sleep manipulation and resisted said ability.
Note that Salem's Low-Godly regeneration needs at least a few hours to bring her back to life and considering Gajou's powers it is within the realm of possibility for him to vaporize her, so if he vaporizes Salem and then traps Garisk in the expansion of domain, after a few hours he and Golden of U will have to face Pink Witch again, which would end up freeing Garisk from the domain expansion.
- It is also quite likely that he uses BFR via portal to send Garisk or Pink Witch into space, something that Pink Witch partially resists and would activate Garisk's temporal resurrection.
- Already aware of Golden of U's threat, with the adaptation and stat amplification given by the fight with Gajou along with his massive skill advantage Garisk would use his sleep manipulation to make Golden of U sleep.
- And finally, the social influence of Garisk and Pink Witch would eventually make Gajou stop fighting, ending the battle after many attempts and deaths on Garisk's part...
Note 1: Please consider that this is based on my conception of what each skill is based on, but as many of my questions were not actually answered, it may be incorrect
Note 2: Due to the prior knowledge of multiple skills, the characters would have complete information which is much more than what I know, so they could act differently according to the real knowledge.
Any counterarguments to my view of how the fight would go down? Any more details?