Since your friend seems to be OK letting others beat on enemies and just doesn't want to personally attack, might have them try a mastermind, taking pets and skipping personal attacks to focus on secondary like nature, empath or FF (others seem more "attacky" to me, but may fall within friend's interests).
And to OP, to echo everyone else, pure heals aren't very useful in this game, especially if it means you're neglecting buffs/debuffs/control/damage. Beyond buffs and debuffs drastically reducing the need for need for heals, literally anyone can play healer to a degree with the medicine pool powers. I've played both blasters and tanks who would toss the occasional heal for groups with no traditional support classes before. However, pure support on the other hand can still be useful, controllers locking down enemies while buffing and debuffing, or defenders/corrupters who slot for debuffs/control in their attacks rather than damage can still bring alot to the team neutering foes and/or turning allies into unstoppable juggernauts. Or you can try the "passive" MMs I mentioned at start if you want to play a character that doesn't personally attack.