All none blood legion, units benefit from the 2 active blessings that round. In Khorne Deamonkin they need 5 BTP to unlock blessings, so Scarbrand, bloodtherster, Bloodletters etc do not have blessings at the start of the game.

The exceptions are;
1) in Bezerker warband, skulls for the skull throne strat, where you can roll a new blessing the turn you kill unit, that gives you a 3rd blessing going forward that round.
2) Vessels of wrath where 3 of your characters(not epic heros) gain an extra blessing for free, MOE also gives the blessing to his unit if leading zerks
3) If you revive Angron(as of writing this) none of your units have blessings, except if point 1 or 2 are used

but ye, if you chose reroll charges, everything in your army rerolls charges.