Assassination: Assassins' assassinations are all similar. What is more creative is Xiao Xiong, who added the method of secret assassination with an animation.
Stealing: Sergio auditore (Revelation). You can also dig out other people's things with a hook blade in battle.
Action: Shao Yun. There is also lightness skill (spiral flash). There are rope darts. Excellent mobility. In addition: Yano should be the fastest climber if there is no such thing as a rope dart.
Battle: Conor Kenway. There should be no objection to this.
Comprehensive strength: If Frye brothers and sisters are one person, then they are. If not, it's Edward. After all, there are many guns.