I write Psylocke Fanfiction and didn't turn her into the McNinja. I took her Telepathy and ran with a natural progression of it.
Now I don't get paid to write my stories about her. I write them fromlove of the character.
Which means I've done my research and did even more research.
Telepathy is literally only limited by the writers inability to be creative, or have it hindered by editorial.
My Psylocke is built purely as a support Telepath. But to give her a few advantages, I gave her Technopathy, the ability to speak to and control electronics. Why?
Because Telepathy is going to be an actual Ability humans will have in the real world. It will be based on Electromagnetic signals we'll send from each other using Organic transmitters and receivers. So I studied that.
Then I gave her an Eidetic memory, to allow her to remember the memories she's read over time. What she does best on a team is LEAD, she's tactics and communications.
She doesn't need to be a badass in close combat, and can take on a robot or a living being for a short time solo. That's why she's part of a team.
When she's solo, I focus on the Investigative aspect of Telepathy, using those abilities including Post Cognition to sense the immediate past.
One of the best examples I've read recently of a woman with a passive ability and yet still badass without being a McNinja is LiveWire from Valiant.
The KEY?
Characterization, and the ability to IGNORE the dreaded power creep.