Stolen Meme

Because Jisu's has me confuzzled.
And you guys should know these people.

I've made a list of 10 characters and assigned them all numbers. Ask me questions about them ("Is 3 human?" "Who's smarter, 4 or 5?" "What would 2 and 7 do if they discovered buried treasure?") and I'll answer. Your mission is to discover which character is which.

List (filled in if guessed):
1)
2)
3)
4) Ryou Shirogane (solved by Jisu)
5)
6)
7) Fakir (solved by Jisu)
8)
9) Yuki Nagato (solved by Saica)
10)