that's a bit dark but it might work.

yes!
LBP 1 (the character) sabotages and kills LBP 3 (the character)
secret ending: LBP 3 (the character) was not dead and "gets rid of" LBP 1 (the character)

ok....
even tho i was talking about a series and the series was about all main LBP games as characters but that's a good levle idea! :)

Uhm.
About that..
LBP 3’s storyline, yes.
Make me one of the three people who has a statue which requires 3 orbs.