About Brand Berserker:
No this version of him is not playable (sadly) but we have normal Herc in the game from day 1
He actually have three weapons in this state
Sword (named: Marmyadose), Axe, and Bow
unlike in our legents where he used fire to prevent grown of new head, in fate he actually used the bow to kill hydra by fireing over thousand arrows in moment. This became his Noble Phantasm Nine lives.
Also in one of the fate works (I wont spoil wich) Heracles was summoned as an Archer and straigh up told Gilgamesh that if he want to kill him he need to use Ea.