It would be cool to have a special power if you don't stray from a power set. Like if you picked Fire and no other power from any other set that a special power would be given as a selection. If you pick any powers outside of that set, the special power would be removed or greyed out. The power would need to be very unique and take advantage of that power set's full potential.
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And playing by myself since Aug 2009
Godtier: Lifetime Subscriber
Epic Stronghold
Block timing explained
But OP, if you want your specific advantage to staying in-framework now? Energy Unlocks.
Which goes way back to the start of this game where I was told by certain devs that there would be a weakness to characters. Some might be strong in Fire but have a weakness against Water or Mental abilities. This would be the checks and balances. If you would focus only on Fire then you would have a weakness elsewhere.