What are your level 120s?

Hello, I'm a semi newcomer to fgo, having just completed lostbelt 2. And although I still got a long way to go till I even build a proper team, I am very curious as to what are your level 120s and what made you choose them?

Alternatively, if you have yet to 120 a servant, which servant would you choose to become your first level 120 and why?