I am not sure how familiar you are with Joseph Campbell's
"The Hero With A Thousand Faces", but I think it would be well worth it if you took a look at it. From my personal readings, I regard Theron as this pure, heroic being that never questions his resolve and always does the right thing. This is good, but for a lengthy story can get very repetitive. To shake it up, you can have him question said resolve. Is he truly doing the right thing? What factors are there in what he does that he never stopped to think about? Maybe he helps a village retrieve an artifact, but once he does he actually helped a village steal that artifact that was never there's to begin with. It is good to have your hero slip up at times. It makes your hero relatable. It makes your character sympathetic.
Of course this also matters when discussing your opponent. I was surprised when I found out you were not wanting Theron to face dark evil entities on the roster, because your RPs have always led me to believe Theron is a paladin whose purpose is to vanquish darkness. That is his bread and butter and personally I feel you are not giving yourself enough credit for writing that kind of character. Theron is the hero the wrestling world needs. Take a look at some of the current faces in WWE that just ooze Good Guy juice without being too Goody Two Shoes about it that it makes people hate them. Think of what makes Bayley and Sami Zayn so popular. Now look at their weaknesses. Watch videos where they lose the big fights and take note on how it made you feel. See how they get back their momentum the very next episode. It all really comes down to
"The Hero's Journey". Here is a quick video that covers that transformation quite extensively, and may help you alter Theron the way you want without having to resort to turning him heel:
[YOUTUBE]Hhk4N9A0oCA[/YOUTUBE]
Maybe you'll need to take a step back and bring Theron back to Humble Beginnings. I'm not saying to take him completely out of the fantasy world. He just may need that return to roots. Who is Shawn Daggers? Why does he feel the need to be a warrior of light? (This might have already been explained in your early RPs, but as someone new on Creative I don't know these things. Don't feel discouraged to give footnotes for the character). You do have something special here. An incorruptible face that isn't completely bland is rare in Literature. But sometimes your RPs do play out a formula. Shake it up. Have Theron only speak to one or two NPCs, instead of the entire Merry Band of Misfits. Take him to a place that truly tests who he is. Not in the "Can He Slay The Dragon?" motif, but more like "Can He Slay The Dragon Within Himself?" Heroes have their darker parts. They get cocky, and they get prideful. Theron is no exception. Maybe he is enraged by all the darkness around him and that's why he is set to eradicate it. But maybe he fears his anger will only grow more darkness. That's pretty much what Batman deals with. Heroes don't just fight physical enemies. There's always something about themselves they must deal with, and often they do so regularly.
If you can piece together what it is Theron needs, then you'll know what Theron needs to beat other WZCW superstars. Sometimes it's not obvious. He may have to fight a Garth Black instead of a John Doe. You'll have to see what evil lurks in Black's character and expel it in your own D&D ways. It's very possible. Sometimes the hero encounters a bandit instead of a dragon. Sometimes you'll face an opponent that an NPC actually likes, and there lies a problem.
Theron is in need of a change in scenery. And yes, maybe a few RPs away from your usual NPCs. This is the story about one hero fighting the evil forces that lurk in a wrestling company, isn't it? Theron is the man. All the rest is just pretty filler. Daggershield is the hero of a thousand faces, and a hero is only as strong as his greatest weakness.
