Toushin Omega

About
Omega was the 24th Toushin to be constructed, and the ultimate Toushin. It has the most offensive capabilities and specializations ever fitted to a Toushin. Toushin Toshi Omega was designed to deal heavy weapons damage, and was more of a specialized military base than the other Toushin Toshi.

It was originally designed to retrofit Freak Paraffin, but Freak was afraid of the idea of losing his sense of self and individuality, backing out at the last minute, as a result, M.M Rune had it sealed beneath the ground.

With a skull-like face and a generally disturbing appearance, Toushin Omega would have been a terrifying force, had it ever been activated.

Kichikuou Rance (non-canon)
In Kichikuou Rance during the Dark Lord phase, Freak Paraffin activates Toushin Omega in order to defeat Dark Lord RedEye, transplating his will to the Toushin and attacking the Dark Lord.

They have a brief but fierce battle in which Omega comes out victorious, but a mad RedEye that fails to accept his defeat attempts to kill Rona Kestina so that she goes down with him. Freak uses Omega to block the attack and sustains severe injuries. He's able to secure Rona's safety but he's destroyed by Dark Lord RedEye immediately after, bringing an end to Omega with him.