Not necessarily "hot", but character design is certainly a big draw for me. At least to get informed about games I would otherwise never bother to look up, and then the rest of the elements convince me to give it a shot.
Like, I love "Cute Girls Doing Cute Things" anime, so the character design and overall relaxed atmosphere that Atelier games seemed to have got me interested. Bought Totori Plus on Vita and Sophie on PC.
I really enjoy attractive characters, and I have a lot of fun joking around with things like Gladio's abs or 2B's booty, but it's more of a "I like it when the characters are attractive" rather than something that I demand to be interested in a game. The concept of a final fantasy road trip and being a sequel to Nier were the biggest draws, and I wouldn't be less interested if the characters all looked like Papa Nier, but for more niche games that I'm not familiar with the franchise, it surely can play a role in fighting for my attention in such busy times.