1. Having a good understanding of what forums rules are and be able to follow it and also enforce it on campaign itself (or else you'll end up with these issues: https://bitcointalksearch.org/topic/signature-campaign-guidelines-read-this-before-starting-or-joining-a-campaign-1684035)
2. If they'll be handling payouts, they should already have some trades below their belt (within the involved amount, a precaution).
3. Punctuality is a plus.
but mostly to be a bounty manager that ranks already HERO of course because of their experience in this forum of course, though so there are also some less good managers in checking the final bounty of ICO. and there are only a few bounty managers who really check as in tokenmarket.net