Youngster’s ability reads:

“Friendly TIE fighters at Range 1-3 may perform the action on your equipped E Upgrade card.“

Is that a base Tie fighter, like the Academy Pilot, or does it includes other ships?

Any pilot in a Tie Fighter, Tie/FO Fighter, or Tie/SF Fighter (when it comes out to general public).

Any pilot in a Tie Fighter, Tie/FO Fighter, or Tie/SF Fighter (when it comes out to general public).

Thanks

All the Eye Balls. No squints, no Dupes, etc.

Hexagonal wings only.

Basically, anything with the words "TIE" and "Fighter" in the ship name. So as bgrelle said, "TIE Fighter", "TIE/fo Fighter" and "TIE/sf Fighter"