Superman X/Kell-El

Superman X as he appears in fan-fics.

Portrayal
Kell is portrayed as much calmer in fics set after Season 2 of Legion of Superheroes, but still a bit more agressive than Superman.

Powers
As Superman's clone, Kell has all of Superman's powers, plus green laser vision due to the Kryptonite in his DNA.

Weaknesses
Thanks to the Kryptonite in his DNA, Kell-El's immune to Kryptonite. However, he is still vulnerable to red sunlight.