Is what you're looking for a dedicated bottom male or a male character with more than just one bottoming scene? I'm actually curious if what you want is for the percent of bottoming scenes to be bigger than ones where the male tops or if it's as simple as adding more than just one or two scenes to a switch character. If that's the case, what kind of positions would you like to see? I'm open to ideas and a discussion.
When I say bottoming, I use it in context where the champion is the one that penetrates their partner, just so that we are clear.
As for content parity, I would prefer it if, in general, guys had equal amounts of bottoming and topping scenes, or within the reach of each other. If the discrepency is to wide, then I feel like you should not bother writing one off scenes just to appease the crowd that is beging for them. For example, If I remember right, you only plan to write one scene where Tetsuya bottoms, which, while a nice gesture, would feel little out place with rest of his content. In his case, unless you (or someone else) are willing to write three scenes where we top him, just having him be husbando for fem/cboy champs is fine.
I do not mind guys like the Elyon or Odo or whoever that follow strict roles from time to time, but I prefer guys like Berwyn/Yonzan to be majority. The boys already have narrower reach in terms of audience: segredating them even more just seems unadvised.
Positions? I prefer the ones where champ is dominating through penetration (mating press, prone bone, full nelson) but I also enjoy when a guy takes charge throuh cowgirl and the like. Like, whatever scene you would write for Drifa of any female (within reason, of course) should work for guys. A hole is a hole at the end of the day.