i'm kinda confused.

i can totally relate, i'm really not sure

idk

bots i think

Yes, they are bots, the creator also confirmed that bots join your game if there aren't enough players. P.S, bots usually have names with around 5 letters, with a dash - or a number example : spot93 BuffaloSt56, a player, on the other hand can have a name like Book, or a generic name like Mark

Yeah, as Rocket said, the creator has confirmed that there will be bots that will show up in multi if not enough people are playing.