This is stemming from the latter half heated Theory about Itachi's eye's debate.
I just wanted to see what people feel about Kakashi and the jutsus he has or hasn't copied thus far in the manga.

By copied, I mean he learned the blueprint/technique/form through observing these characters, not necessarily the ability to perform them (*mange sharingan)

Three debated:
Kage Buushin from Naruto
8 Celestial Gates from Lee
Mange Sharingan from Itachi

EDIT: I'm expecting most to agree with kage buushin, and the gates - maybe a few radicals to agree with mange sharingan. But that's just my expectations. Maybe I'm seeing connections here that no one else sees...