I'm sorry if I'm a little over-enthused, by the way. I cannot express how much I love talking superheroes and supervillains, even just concepts.
I would please ask that you never apologize for your over-enthusiasm. Especially when it's an over-enthusiam that I happen to share. If anything, we should both apologize to the rest of the thread for taking over it with our fangasming over each other's characters...But I'm not about to do that either. 
For example, now I want to pester you into cultivating backstories and such. 
Sorry to disappoint, but if I had better/more concrete ideas, I would have already shared them by now 
And my brain immediately launched into potential ideas for what the person my heroine is protecting would be like. Maybe someone who's just in over their head, with powers they can't control.
Like Ace from Justice League Unlimited. I love those kinds of tragic characters. But while Horizon would feel sorry for the character's fear and suffering, he would push it to the side and calmly tell you to "Please hand over the anomaly."
Okay, I think I like Logos the best (that sounds like my favorite kind of scene), but only by a narrow margin. Horizon somewhat reminds me of a superpowered Javert, which is a very cool concept, but Logos seems like the kind of figure who would inspire hordes of followers, and who would offer his enemies a seat at a dinner table and unnerve them by serving their favorite food. I really can't get enough of that kind of tension.
I imagine your heroine looking cautiously down at her plate and then up at Logos with an expression on her face that reads "Do you really expect me to eat this?" To which my villain would smile and reply "I understand your hesitation. 'Is it poisoned? What if it's drugged? Cyanide...Arsenic...A toxin that paralyses my body or corrupts my mind?' Well, my dear, I know it isn't much, but the only assurance I can give you is this: There is no substance on earth that would grant me more control over you than I have right now."