Assuming that divine is not possible at this point what hero should be prioritized when shards become available (bird man, demon guy with a spear, wonder woman, guy with a tank, or imp person>? I have each at 130 with max skill so I'm preparing (bird man is 155 with no divine)
To answer your question: usually the latest hero is best to invest as long as you haven't spent too many resources trying to get divines into other heroes already. As soon as you're getting a divine, you're pretty much stuck with that hero as he's now very powerful.
To give you additional information: as long as you do not have divine powers (and can't get them anytime soonish) you may first want to focus on hero aids. Are you familiar with the usage of hero aids?
Watch the following thread if you aren't familiar with hero aids: