Draco Bahamut |
I would make a Sentai Vigilante Archetype, and give a class ability called Mecha Eidolon, and basically being like a Synthesist, but they could do a composed mecha merging all the mechas in a giant mecha eidolon.
The Eidolon would be a lot more limited than a summoner Eidolon, so they couldn ´t be used too often or inside dungeons.