Actually pretty good
Kindred, one idea I have for David's first transformation into the Hulk is during their first major battle with a team of villains -- one of the baddies seemingly kills Caty, and David loses his shit like Goku going Super Saiyan for the first time and just explodes in all his green fury. Then she can pop back out and try to convince him she's fine and calm him back down. What do you think?

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I still need to finish Crisis on Infinite Earths. I kept up to date with Arrow, Flash, Legends of Tomorrow, and Supergirl for a few years, but now I'm behind on everything. The only thing I'm partially caught up on is Flash -- I've seen everything up until the Crisis crossover arc. I watched the first few parts that aired in December, but haven't seen the conclusion or the second half of the Flash season.
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Yeah, we should hold off on any more siblings for a while, lol. You could have one of them and then maybe bring in the other later down the road. Though since you mentioned them, I feel I should clarify that the "Victor von Hassen" referenced in my post is my version of Victor von Doom with a more real-world last name, lol, modeled after Hassenstadt, the capital city of Latveria before it was renamed Doomstadt in the comics.

Not sure yet.