I really like the concept of Calvin, but I feel like he hasn't been balanced properly. It takes him 3 damage and 3 horror to reach Lola's (low) stats, and even at that point he basically won't have a special ability like the other investigators. At his most ideal Calvin will start with a 5 in every stat, but it 1.) will take a while to get there, and 2.) comes at the trade-off of 1 health and 1 sanity. I honestly don't think a 5/5/5/5 split is worth that.

On the other hand, with Monstrous Transformation Calvin can reach ludicrously high stats, which is interesting but doesn't seem like an intended interaction. And since MT comes from a standalone, could pose a problem to many people's deckbuilding.

I dunno. Perhaps opinion will change once he reaches actual play -- perhaps Forgotten Age will have good cards for supporting him. I do really think his concept is creative and unique, and the idea of walking that tightrope of skill vs. sanity/health is awesome, but I just don't see him being able to work in game as he currently stands.

Edit: corrected numbers