+ Ayaka [Because that would be interesting]
Send me “+” and the name of a character if you want me to write how things would go and what their relationship would be like if that character summoned mine as a Servant in the Holy Grail War, whether in place of their canon Servant or in general.
((ooc: shamelessly stealing the way you answered this, because that was a cool way to answer it.))
The actual summoning would be as grand and ostentatious as the one it would materialize. Expect (harmless) explosions, loud noises, and golden light aplenty. Gilgamesh isn’t too impressed with Ayaka during first meetings due to how normal she is, but he’d probably be partial to assisting her because I think he’d still consider her more beautiful than the women of Uruk. He wouldn’t fall for her immediately, but that combined with potential interesting things would cause him to accept her. Lancer is driven away easily as a result.
Gilgamesh is still in the War just to prove he’s the strongest and because the Grail’s still a treasure, but he makes no secret of how dubious he considers the whole thing. They get along like oil and water at first because she’s a fairly rational girl and he’s Gilgamesh, but he still advises her with pinpoint accuracy when it becomes necessary to preserve her. This doesn’t stop him from breaking her glasses whenever she gets too uppity for his liking, though.
He joins her school at her behest, if only so she can make sure that he’s not getting into too much trouble without her supervision. He uses the opportunity to become super-popular and needles Ayaka without actually causing problems for her, so she doesn’t really have a way to retaliate.
Despite how incredibly they clash at first, they start to grow relatively closer as they learn more about each other. She gains an inkling of why he’s such a shit, and he starts to see who she could be becoming reality. If he was summoned by Manaka last war, he grows a bit more considerate towards Ayaka after realizing what that meant his Master likely went through.
They get through the Holy Grail War on a rocket surfboard. The poisoning is no issue because Gil still has the antidote, and even if he didn’t he’d probably have several other treasures that would have worked in its place.
Archer Alter never materializes due to Gil being an Absolute Existence, and thus cannot be tainted. Everybody besides him is kinda vexed by this. Manaka pouts before just throwing her hands in the air and sending the Beast in to do its thing.
Final battle is…weird. And awesome. But so weird. Gil finally bites the bullet and uses Ea, so Ayaka wins…technically.
By the end, barring shipping shenanigans I think they’d have a relationship half-way between what he had with Kirei and what he had with Hakuno at the end of CCC. She’d be a favored servant and/or not-friend to the King, and she’d be able to handle his Gilgamesh-ness well enough that it no longer bothers her. They actually get along pretty well for the time they have before Gil’s sent back to the Throne of Heroes. Ayaka goes on to design a visual novel based on her experiences, becoming her universe’s gender-bent Nasu because why not.