O.P.

O.P. is a Mini-Con from the Aligned continuity family.

Yeah, you know me.

O.P. (オーピー Ōpī) is Optimus Prime's Arms Micron.

Fiction

Arms Micron Theater

Voice actor: Toshiyuki Morikawa (Japanese)

O.P., B.2, and R.A. tried to transform. Perfect Transformation! Enter the Transformers B.2 and R.A. succeeded at transforming into robot mode, but O.P. still struggled. Dark Transformation! Dark Energon

Toys

Prime

• Optimus Prime (Voyager, 3-31-2012)
  • Set ID number: AM-01
  • Micron ID number: M-01
  • Energon crystal: AP Pure

Available only with AM-01 Optimus Prime, O.P. transforms from a humanoid robot into a weapon combining Optimus's cannon and blade weapons (which were omitted from the Japanese release). He has numerous 5mm posts and holes that allow him to combine with other Arms Microns to form any number of "Combo Weapons" and "Super Combo Weapons", though he is specifically called out as forming the lower-blade/guard portion of the Star Saber with B.2 and R.A. He also has a clear-plastic gem that is part of an as-of-yet-explained game system.

O.P. comes out of the package as a bunch of unpainted parts on runners, like a model kit.

• Battle Shield Optimus (Multi-pack, 8-12 2012)
  • Energon crystal: AP Pure

A gray version of O.P., dubbed O.P. A, was made available in the Japanese ToysЯUs exclusive Battle Shield Optimus multi-pack. The set included O.P. A, a redeco of AM-01 Optimus Prime, gold versions of the three Cosmotector Microns (Pral, Sais and Jayz), and a cardboard trailer unit that could serve as a Micron mounting base and carry a single Deluxe-class car.

Currently we have no idea what the "A" is supposed to stand for.