That charity is definitely for a good cause. With how popular video games are, people with disabilities should not be excluded from joining in on the fun.
I would choose to be a good mix of both conqueror and diplomat. Extend an arm to those that deserve it, with no fear of a fight to those that disrespect the clan.
Picking a favourite Assassin's Creed game is super difficult. After playing all of them it's got to be a draw between AC Revelations because old Ezio is awesome, AC Rouge because the gameplay felt slightly more refined than Black Flags and AC Odyssey because ancient Greece is one of my all time...