[quote=@arowne97]
[quote=@JohnWolff]
[quote=@arowne97]
he actually hated the way the world was at the time. His ultimate noble phantasm, Ea, is an Anti-world noble phantasm after all, so he's the most powerful servant. Even the Savers are nothing to him. He knows the state of the world at all times. He also does know how to wield every weapon in his storehouse. EVERY weapon.[/quote]
I'm still not convinced he's not some chauvinistic pig of a sadist.
[/quote]

Gilgamesh's personality is heavily influenced by the era into which he is summoned. The world, his property, of Fate/stay night was sullied by the consumption society of the early 2000s, so he was in a worse mood overall. He has taken a liking to the virtual world of 2032, so his personality is more stable and closer to how it was during life. Arco Wada says he reminds her of Gilgamesh in Fate/hollow ataraxia. He still displays his normal self-centered traits, but Nasu wished to show that there is more to his character than that. 

copied and pasted from the wiki. :P
[/quote]

And the. There's Fate/strange fake Gil.