Finn showed real strength and then struggled with his identity in SW VII. I felt like they were going for a parallel to Han. But in VIII they turn him into a coward who was going AWOL only to redeem him by having him sacrifice himself, err no, have Rose try to kill him on Crait. But then he really does redeem himself by killing Kenny, err Phasma... again.
I seriously wonder how they're going to have Finn kill Phasma in IX. If I were the actress for Phasma, I'd be pissed. All the other women get kick-butt opportunities, but she's summarily killed off by a coward, low-level janitorial storm trooper. What a joke... just like Star Wars has become.