Gladiator were normally not used on the battlefield, except in really desperate situation, such as during the battle of Cannae, in 216 b.c., depicted in game. The clearly did not used the extravagant armory depicted in the game.
Balearic slingers were in fact one of the most famous and brutal warrior of the Antiquity, highly paid for their service by both Romans and Punics.
Northern Africa elephants were smaller than present day elephants, being around 2,5 m at the shoulder, against over 3,5 m. They wouldn't be able to carry battle towers such like those depicted over Indian elephants from Persia. Use in wars and circus estinguisced this extrardinary specie, more docile than actual African Elephants.
While depicted almost as exclusively as an African faction, the ancient Cartaghe used group of mercenary from half of the Mediterrrean world: iberians, Celts, Lybians, Greeks, Italians, Sardinians and even Spartans and Persians advisers.