Ultron. He fits perfectly and is an awesome villain. He’s a fun villain and I’d love to see him completely destroy the Toa’s world. His ability to jump into new machine’s would make him an interesting opponent.
Another character that’s a bit different would be GLaDOS. She is completely different than anything in Bionicle. She could start off in her original body after being brought there through portal experimentation. However, once she goes to the Bionicle universe she could get a more mobile body. But I’d love to see her be just a jerk to the toa. I’d be loads of fun and completely different.
I don’t think that would go down to well in Bionicle, I’d think. Either the characters are bionicles or they’re just with Bionicles, the translation between universes seems like it’d go badly.
Toothless(Httyd):Rahi
Godzilla:Creature on Bara Magna
The Predator: a species in the Matoran Universe
Pikachu: Rahi
Megatron: Makuta or Skrall
Spiderman: Glatorian
Wolverine: Rogue Makuta Experiment
Jason(Friday the 14th): Rogue Makuta Experiment
Rambo: Glatorian
Spongebob: Matoran
Mario: Toa of Fire
Kermit the Frog: A Talking Rahi
The Cast of Pawn Stars: Po-Matoran + Turaga
G1 Megatron: Makuta of Kaon
Aquaman: Water Glatorian
Samus: Order of Mata Nui Member
Link: Toa of Air
Patrick: A Onu-Matoran
Homer Simpson: Toa of Fire
Green Goblin: Dark Hunter
Finn from Adventure Time as a Toa.
Jake from Adventure Time as a Rahi.
Mordecai and Rigby from Regular Show as matoran.
Cloud from Final Fantasy 7 as a Toa.
Sephiroth from Final Fantasy 7 as a Toa who then turns into a Makuta.
Emmet from The Lego Movie as a Matoran who then turns into a Toa.
Wyldstyle from The Lego Movie as a Toa.
Ruby, Weiss, Blake, and Yang from RWBY as matoran who then turns into toa.