Is some an adjective
Yes. It describes how many there are of something.Take this as an example:There are jelly beans leftover. That could be any amount, whereasThere are some jelly beans leftover. It describes the amount of jelly bean.
it's a complementAn object complement can be a noun, pronoun, or adjective that follows and modifies a direct object. It can describe, clarify, re-name, or show completion of a process
Noooo it dosen't describe anythin