Omega, from The Lego Ninjago Movie (2017), is heavily implied to be the same unseen Omega from Lego: The Adventures of Clutch Powers (2010), who was responsible for Powers' father disappearance in
LEGO Ninjago Custom Omega Oni Minifigure - YouTube
LEGO Oni Battle Pack Set 853866 | Brick Owl - LEGO Marketplace