I think this is the one aspect of Titans of Justice I'm not yet understanding. To what degree are our characters based on us? How will that work?

But how does it come to resemble our own personalities? Do we contribute information to make that happen, or does Dr. Poison give a best guess, and how far does it go?

I was not intending my new female Firestorm to be a 35 year old married man

I'm pretty flexible on this.  Members can either submit a character that is based on their personality, likes, dislikes, etc. along with sharing their first name or they can do such as you did and just submit a cool character concept that they come up with.

Let me know if you'd like me to flesh out more in terms of characterization. I hadn't given it much thought, but I'm happy to come up with something.

Okay.

So Danna is a pretty serious-minded young woman. Extremely dedicated and intelligent (a nice contrast to her father), but not particularly on the adventurous side. I imagine her a little older than her father was when he started out. She was a graduate student studying under an aging/ailing Professor Stein (maybe he even staved off retirement out of obligation to Ronnie, having promised to assist his daughter), before it became necessary for the two to combine and become Firestorm.

The fun I see in this series is in the inversion. I imagine an older Prof. Stein who once believed nuclear science could help the world has grown immensely more cynical over time, now in his final years and seeing the world in a sorrier state of affairs than it ever was in the early 1980s. The world is a lot less stable, terrorism is rampant, and technology has utterly failed to do anything to raise people's quality of life -- it just gave them smartphones instead. Thus, whereas Stein once had to play conscience to the impulsive Ronnie Raymond, Danna is now the one holding the professor back at times and, at others, imploring him to provide aid when she doesn't know enough of the physics herself.

Whereas Firestorm I's ultimate goal was for Professor Stein to produce a productive and well adjusted citizen in the form Ronnie Raymond, Firestorm III's goal is to give a man his final redemption before death in the form of Professor Stein, as well as, perhaps, offer us all a less jaded view of mankind and his future (though not in a corny cheerleader sort of way).

Do with it what you will!

Sure, if there's no Courtney Whitmore in your universe... or maybe it could be an older one he digs up from the Starman museum or something.   I didn't want him to be too powerful, and I thought having both the Rod and mist powers would be