La Volpe (Assassins Creed 2)
Leader of the thieves in Assassins Creed 2, La Volpe joins Ezio on several missions, and offers the assistance of his thieves to provide distractions.
Domenico and Renato Auditore (Assassin's Creed 2)
The first patriarchs to bear the Auditore name, since it didnt exist before they thought it up. Once a humble sailors son living in Venice, Domenico met the Assassin Dante (no, the other Dante) and began training in the ways of the Brotherhood. He eventually married and has a son, Renato, and the two fled Venice after things went belly up and Templars came for their heads. Domenico adopted the Auditore surname, built the Villa Auditore and integrated his family into the nobility of Florence. Not bad for a former barnacle-scraper.
And yes, we know this is an image of the Monteriggioni villa. We don't have a pic of Domenico and Renato.
Nicollo Machiavelli (Assassins Creed Brotherhood)
Famous tactician and thinker, renowned for his ruthless planning and social strategising. Despite this, though, hes a decent - if ambitious - guy who assists Ezio while hes a young Assassin.
Yusuf Tazim (Assassins Creed Revelations)
Master of the Constantinople Assassins guild, Yusuf is an easy-going guy who gets Ezio set-up in the city.
Piri Reis (Assassins Creed Revelations)
A famous Ottoman admiral, Piri Reis joins the Assassin Brotherhood as a cartographer who conveniently designs bombs on the side. Hes the one to thank when Ezio scares a crowd of people half to death by tossing around blood bombs.
The Polos (Assassins Creed: Revelations, Assassins Creed: The Secret Crusade)
Already famous traders by the time they were invited to meet with the Assassin Order, Maffeo and Niccolo Polo tasked with the protection of Altairs Codex and memory seals when the Brotherhood was forced to flee Masyaf. They kind of messed that up by losing the Codex to Mongols two days later, but Niccolos son, Marco Polo, redeemed them by stealing it back from Genghis Khan in 1275.
Connor Kenway or Ratonhnhake:ton (born 1756) (Assassin's Creed 3)
The po-faced Assassin, Connor joins the Brotherhood to resolve his daddy issues. See, his father Haytham (who is a much more interesting character) is a Templar, and has grand designs for revolutionary America that dont align with Connors strict sense of justice. In his spare time, Connor enjoys sailing and killing small animals.
Achilles Davenport (Assassin's Creed 3, Assassins Creed Rogue)
A former Master Assassin who trains Connor during AC3. He lives in the forests of upper New York state, and is a cranky old bastard. Nice house, though.
Miko (Assassins Creed 3)
The holder of the Grand Temple Key and Haythams first unfortunate victim in AC3. These two have something of a history, since Haytham stole his very first Hidden Blade off Miko before swearing to kill him the next time they met. Yeah, not the most enviable legacy.
Clipper Wilkinson (Assassins Creed 3)
This chaps a bugger with a rifle. A notable sharpshooter, he gives Connor the ability to pick off enemies at a distance once hes recruited.