Which of the below heroes should I use:?
I would use as main team:
Walla, PD/Michael (PD have poor talent), Cupid, , SK, HB, maybe Ribbit (for area damage) or Creation (for sniping enemy heroes).
Check Warehouse, maybe there are hiding some good heroes also.
As for selection Walla, Cupid, PD/Michael would be core of team. PD is good if he have good talent like Empower, Regenerate, eventually Zerk or Revite, all talents 5+. If not than Michael will be better.
SK is still strong, if not used against debuffers, HB may do some damage and remove energy.
Ribbit is one of those "don't have better area damage options" so she can help in raids.
Creation would be better if you want to snipe enemy heroes first.
So i think you have some options, taka care of Walla and Cupid in fist place, trying to find better heroes.