8) Arno Dorian
Arno was the son of an Assassin whose father was murdered by Chief Asshole Shay. He ended up being adopted by Templar De La Serre, despite his Assassin heritage, which was sweet… until De La Serre ended up murdered and Arno was framed. In prison, Arno learned of his true upbringing from Bellec and decided to join the Brotherhood to atone for past mistakes.
But it doesn’t make sense why Arno switches over to the Assassins. He doesn’t know any of them, this is the first time they’ve ever met. For all he knows, they could just be lying to get him to do what they want. Even not counting that, Arno just feels like the least interesting parts of Altair and Ezio fused together; an arrogant womanizer who acts mostly based on impulse and rash decisions, giving up on the whole Assassin thing after his crush Elisa rejects him for not doing the only thing in the job description. He’s not the weakest lead in the series, but he definitely comes close.
