If the bad guy's written any books, I could analyse the SMURF out of them (English Lit student).

I could keep the party entertained with my singing and piano playing (Grade 8 and Grade 7 respectively, in terms of piano I do mainly baroque and classical but also have some experience with jazz and ragtime, and with singing I've done pretty much every style).

Seeing as we're in a JRPG land, I could give the party English lessons to improve their language skills (as long as they already had a firm basic knowledge, I've no experience teaching it from scratch).

I can sail dinghies (the journey to the bad guy might involve crossing a body of water at some point, after all).

I've only done it a couple of times, but I'm actually pretty good at fencing. I'm sure that with a bit of training, that could be turned into a useful fighting skill.

Basically, I'd be an indispensable member of the team.