I think it would be awesome if some of our enemies could include evil Spiral Knights. They be colored red, and their gear would consist of full sets (i.e., cobalt, calibur, defender). Perhaps the gear sets they have would be determined by stratum. They could face their targets while moving in different directions. They will attempt to dodge player attacks and, failing that, shield right before the attacks hit. They will use full sword combos when they have the opportunity, use charge attacks to break your shield, use a gun when at range, use a gun charge attack against a shielded opponent at range, and use bombs when isolating a player is difficult to do safely (e.g., when the players are in a pack).
These would essentially be boss fights. Ideas or suggestions, anyone?
P.S. Mecha knights aren't nearly smart enough.
The Phantoms prehaps? They are somewhat knightlike.
Almarian knights would be cool. With some variation of almarian crusader and cobalt, but with the color scheme of the crest of almire. Though having them switch weapons frequently would be annoying, becuase if you fought a pack of them, they would all do the same thing. They need to switch weapons based on their allies as well, not just the opponent movement patterns.