Remus
Remus, son of Mamers (Mars), grandson of Numitor and brother of his worse enemy, Romulus. He was abandoned on the Tiberis and was saved by a wolf with his brother. They were adopted by a farmer and soon became young adults. His brother lived as a thief and bandit and he lived as a shepherd. Soon they have decided to leave their adoptive parents' home and found a new village. The two brothers had to decide which one should found the city so, after a few days, they gathered their allies and started a war.
Remus didn't have external allies (Tusci and Equi) as Romulus, but had good skirmish troops and even chariots from the Aventinus Mons, he also had a lot of troops devoted to certain gods (especially Mamers (Mars) and Menerva (Minerva)):
Comites Remii (Remus' personal guard, elite spearmen, throw spear before melee)
Comites Ducis (general's bodyguard)
Equites Aventini (skirmish cavalry)
Equites Tiberis (heavy cavalry, sword)
Currus Mamertis (heavy chariots, throw javelins)
Currus Aventini (light chariots, throw javelins)
Hoplites (elite spearmen, very expensive)
Praesidies Aventini (elite heavy skirmishers, javelins, sword, large shield)
Hastati (basic spearmen, throw spear before melee)
Pedites Aventini (basic spearmen, use sling before melee)
Pedites Securiferi (two handed axemen)
Vigiles Ianus (heavy spearmen, guards of the gateways of the city, Ianus was the god of the doors (in latin Ianua))
Vigiles (light spearmen, watchmen)
Pastores (use club)
Milites Aventini (light swordsmen, throw spear before melee)
Funditores Mamertis (heavy slingers)
Funditores Aventini (slingers)
Sagittarii Aventini (archers)
Sagittarii Menervae (elite archers)
Rorarii (javelinmen)
I'm going to add descriptions for each unit.