It's totally possible and a player did it in one of my game. The challenge with Gestalt is the "Duration: Sustained" part. You get KO? Your symbiote is kicked out or something. You can buy extras to make this continuous if you like. Just remember that gestalt is meant to represent two creatures (or more) of equal power level that together creates a single more powerful being. So if you play in a 150 PP campaign, your human and your symbiote would have 75 PP each etc. It's possible but I think there are simpler approach.

What my player did was to think about it the other way around. Why not play an alien with mind control on contact? So he played the alien and used the Boost power to increase a mundane guy and took powers (like super-strength, super-speed, strike etc.) with flaw that requires him to be physically attached to a body to function. A mix of flaws and drawbacks and you're good to go.

If you want your symbiote to be able to control other bodies and use them to protect the main host, you can use mind control on other guys here's what I suggest: Summon.

Usually people think of summon as this unnatural way to call a minion here. Magic or teleport etc. But it's actually a simple way to have quick help come from somewhere. Having a move called "Call security" (Summon Minion with flaw: delay 5 min) is a good example of how you can use it. So I would have Summon (in fiction you simply mind controlled a bystander who suddenly helps you. Add the power modifier called Sacrifice and you can use those minions to intercept attacks!

How can I model a human who gets powers from a part-time symbiote alien?
I’ve found myself writing the phrase “as soon as possible” just too often. Sometimes I wonder if it sounds a little rude. How can I convey the same meaning in a more polite way but without losing sense of urgency?
