Stellaris without ten thousand DLCs.

I was recently apart of a conversation on Reddit about an ideal Teen Titans game. I concluded that the other 4 team members from the cartoon would work, but...

Beast Boy's full power isn't remotely feasible in a game unless he had a AAA project all to himself. If he's included as a playable team member along with the rest, then we'd have a few dozen animals to select from at best and controls/stats would be simple. So I'm fully on-board for Beast Boy just having a game all to himself, and it would something like this:

I'm thinking a Lego Games-style character selection, but every choice is a green animal with listed skills. Animals should be categorized based on what kind of use a given species has. Groups should be: tiny venomous bugs (good for stealth attacks, and each venom has different stat de-buffs.), small vertebrates (Some items are too big for bugs to carry, but can only be found through small tunnels.), birds of prey (For when you want to both fly and fight!), dinosaurs/giant mammals (Need I say more?), speedy athletes (To keep up with Cyborg's car, if nothing else.), and strong fish. (Whales/dolphins might be listed here because utility beats Science for the purpose of this feature.) Tempt me, and I'll list ideal species to go in each of these categories.

BB starts with 1 animal in each category, but how should more animals be unlocked? Collecting DNA samples as an old-fashion collect-a-thon ala Sam Raimi's Spider-Man 2 could be a good "didn't think of a better way" system. If we go a more Elder Scrolls path, using each category would fill an experience meter to unlock more animals with the same basic purpose.

The real challenge, and the main reason I'd want a dedicated Beast Boy game, is that finely crafting every animal's animations, stats, and controls would be a bankruptcy and a half. For instance, you'd think only apes could ride motorcycles, but I've dead-serious seen a video of a giraffe trying it and it got all 4 hooves in the correct position for a second or so despite being several times taller than the bike. BB once became a whale on dry-land just to body-slam a villain (I forget who), who then picked him up and threw the whale away. A big budget would allow unpredictable interactions to play out organically and there'll be no room for other Titans if that route was taken.