Utterly Mad

What about a situation of two identical Harmonics going up against each other?
Or the possibility of two people combining a Harmonic, to give some new, or unusual, effect?

Also Fluid Harmonics would technically be unstoppable against others HEM users, since they'd be able to drain the Harmonic Fluid from anyone (possibly able to recharge themselves with it?)

Well, I never actually planned on pitting HEM users against eachother, what with the HEM unit being a very rare piece of equipment that's only been installed in the players, and the players are working together to figure out who they are, what built them, why there's a ton of people trying to kill them, yadda yadda yadda...

...But now that you mention it, it would be really cool to see a fight like that. Kinda like Iron Man fighting his own suits or something. LET'S DO IT.

The Fluid harmonic doesn't work against Harmonic Fluid because... Reasons. Maybe it's because the Fluid is tuned to a different frequency than the Fluid's HEM unit is tuned to? Something like that. I'll work it out.

Combining Harmonics together sounds like a great idea, and something that I did plan to happen in the RP. Usually it would occur with two users interfacing with eachother's Units, probably through some form of physical contact, and then using their units together. For a single HEM unit to be tuned to two frequencies is impossible with their current setup, but with a little know-how I don't see why it couldn't happen.