Question and Update

My Question:
Okay, I have my doubts I'll get this answered, but it's worth a shot I guess. Does anyone know anything about who Flash Sentry is as a character? and what his personality is? As a TwiDash fan, I obviously don't wish to pair Flash with Twilight, but in an act of fairness, I don't want to blindly think 'meh' of him either.

I really have no set opinion of him. I don't hate the guy, but I don't like him either, and the reason why...is because I don't know anything about this guy. Ever since EQG, which didn't seem to offer much in the way of finding anything remotely interesting about this guy, I've been hoping the fandom could fill in the blanks and find something interesting about this guy, like it has done so many times for so many background characters. Unfortunately, it doesn't seem to be happening. So far I've seen 3 different versions of him: he acts much like Brad (who as aforementioned, is not a very interesting individual and pretty much is like any basic handsome male high-school student), he's kinda like Shining in a way (which is kinda cool, but makes me raise a brow considering this stallion is now competing with Comet Tail as the most popular heterosexual pairing for Twilight), or he kinda acts a little like Rainbow Dash (which is cool with me considering I'm a TwiDash fan, but why would I pair Twi up with a 'copy' of Rainbow when I can just pair her up with the real Rainbow).

I've spent 2-3 months now trying to piece a solid picture of this guy, but so far I have better structured image of a changeling than I do with him. If anyone can shed some light on this, I'd greatly appreciate it.

Update (Story-wise):
My hands/hooves are actually kinda full with unfinished and planned stories. Outside of my story, "Voyage of Peace", I'm also working on the sequel to two different stories, as well as an OctaScratch fic. The next chapter of Voyage of Peace is already complete and I've already handed it off to my editor, as well as the first chapter to one of those planned sequels, I just need to give my editor a good kick so he'll actually check it.

Anyway, two planned sequels are for "Prismatic Dusk" and "My Little Spike". I've been feeling myself pulled by both stories to work on, but I can't seem to make up my mind on which to focus on. Which do you guys want to see done first? Or is there another story you'd like me to work on first?