RE: The Naruversity
I like Quake Release. It could be used for both sound based attacks and attacking with vibrations through solid and liquid mediums, so sonic booms, tsunamis and earthquakes would all be fair game.
Sorry for aggravating you by comparing your Plasma release to Dust Release. It's just that, well, the two ways you described it primarily being used sounded extremely similar to Oonoki's 'Detachment of the Primitive World' and 'Detachment of the Primitive World: Pillar' ninjutsu.
I don't have any solid ideas for alternatives, but I do have a couple suggestions. Maybe instead of trying to figure out a logical physical reaction between the two elements (ala Ice Release or Lava Release), you could try being more abstract? Find some poetic link between the elements, or something separate that links them together somehow. Sort of like how Water and Earth makes Wood, apparently just because plants require both substances to survive. Or how Scorch release literally sucks water out of living things, I guess because hot air makes people thirsty?
...Actually, thinking along those lines, maybe you could still use that plasma concept. For example, the sun is made of plasma, and it emits a lot of light. So maybe Fire and Lighting combined could result in a "Light Release" bloodline that can control light. Blind people with darkness, create hologram-based genjutsu, turn invisible, shoot lasers, etc.
Or you could copy Storm Release and simply combine the basic properties of both styles of ninjutsu. Fire chakra is hot and creates concussive blasts, and lightning chakra is conductive and pierces. So maybe Plasma Release could create superheated exploding lightning bolts, or fire that flows through objects and burns them from the inside-out, or like the ultimate raikiri that can pierce the heavens.