Well a nice method to figure out is to try to imagine how the plasma actually works (or could work if existed anyway). It involves light outside of a vacuum, which means some oxygen/air is burnt. And since more air has to fill the void, the sound must include something "air-y". Before the plasma bolt is emitted (that is while it is generated inside the gun), some other sound must also be made. Plasma guns are highly electronic guns (as opposed to mechanic guns), so you'll need to make sounds of "fluctuating" capacitors (some high-end GFX cards can be heard doing capacitor noises or something like that - well you can fake it with some FM synthesizer perhaps). To generate the needed energy, a plasma needs some sort of transformer too. These make low-frequency humming sounds which increase a bit in frequency just before the capacitors' sound enter in place. Plasma is a ball of energy so when it "hits" the ground, the electrism discharges - so you need that part too. Finding "electrism" sounds shouldn't be hard. Note that this part should also include air since electricity burns oxygen too.
So a "pattern" should go like this:
For firing: transformer humming + capacitor charging and then discharging + oxygen burning/air filling (these should be mixed but not start at the same time - they should overlap but not be independent either)
For plasma flyby: more dense oxygen burning/air filling
For hitting: low-bass sound for hitting the target + some electric splash sound followed by pure electric sound as the plasma discharges
Or something like this. I just made up the above
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