Hiya brocks! I would recommend necro. The Druid/necro duo is a powerhouse.
Ther are other options as we'll and inevitably discussion will devolve to people insisting that your friend re-roll shaman and subsequently that cleric/enchanter is the only option ^^
Those are viable options and a chanty wouldn't make a bad partner in the least, nor would a hard for that matter ^^ might also consider a Mage or even a shaman.
Good luck and hope one of those is appealing to you! If not, just roll whatever you like. A Druid is a pretty versatile partner and are able sunergize well with most other classes ^^
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