wizard/bard, you can either kite (and the wizzy can snare even), or if you guys work well together, bard can time mez to land JUST after the nuke lands. Mob is mezzed, nuked, mezzed again, hopefully with minimal to no damage taken, and mana song is a bonus.
A chanter is an excellent partner for fear kiting. Fear kiting as a bard can be a little annoying due to short duration fear and high resists. Chanter has a much longer lasting spell fear, freeing up the bard to snare, dot, melee, etc. If the chanter does the pull, or at least gets aggro, there's an extra pet to throw after the mob too.
Another strat with a chanter is charming. Charm dps is awesome until oow. There are a lot of ways you can play around with charm, bards have charm too, so if you're a charming chaos freak like me, it's a lot of fun. Against really dangerous mobs, the bard can backup cc on a charm break, and help keep everyone alive for round 2.
Druid ds stacks, they have a heal, but for duoing you guys will probably kite a lot. Also, charm animal can be fun, it's just more limited for your hunting options. Same with Fear.
All three can root / dot. Works great. I don't think you can go wrong with any of them, they're all going to be fun. If you want him to be able to charm, encourage him to go for a chanter or a druid. If you want him to be able to port, go for a druid or a wiz. Or just tell him to make up his mind.