I’d say Lenny. I really liked his character and the missions with him were always entertaining. It also felt so personal when he and Arthur were together - you could really see how much he liked him. (Spoilers) I were of course really sad when Hosea died but even though they quickly brushed over it Lenny’s death was the most impactful to me - and the fact that Arthur seemed to be the only one to really care when he stopped at the roof. Lenny was young, naive and full of willpower and to see him die so early and sudden was very sad and made me think about his character and how meaningless he died, everyone rushing along to escape. Sorry about the rant i dunno what got into me, but yeah long story short; Lenny.