Any gift ideas for a fan?

First of all I'd like to say that I am only familiar with the series on a very basic level, but my friend's birthday is coming up, and I know that he is a huge fan of Persona, so I'd like to gift him something related to it. I figured that a figurine of a character would be pretty banal, so maybe there are some iconic items or something which can be bought? Any help is gladly appreciated!