Unless it’s specifically related to the role, I don’ think it’s necessarily great in a mini-portfolio.
I think it can work in a portfolio in an interview scenario though, it’s great to know more about a person to know if they’ll be a good fit in a team, and hobbies outside design can be a great insight in to the person themselves as well as the designer. But the design bit definitely comes first, I think it can be a nice addition… but maybe not if it involves boobs!!
Do you have examples of the type of thing you’re thinking of including?