The Chains of Commanding: He really didn't want to be leader after being separated from the rest of the group, especially since the job requires a great deal of pragmatism he's frankly too nice to be comfortable with.
Agent Scully: Even as a child he firmly believed in science over superstition.
He Knows Too Much: What ultimately leads to his death is the fact that he happened to witness Fukubei's faked "miracle," and would know that any other resurrection he would have as Friend would be fake as well.
My God, What Have I Done?: Realizes sometime after after Friend's "ressurrection", that the man was a fake who was planning something terrible. This is what led to his near poisoning so he could be replaced with a Friend-allied clergy.
For Science!: One of the primary reasons for making his giant robot: he thought the fake one was such a piece of crap that he felt obligated to make a real one.
It was probably all he had left, given he eventually realized (off-screen) that his daughter wasn't being held hostage, but had actively joined the Friends.
Chekhov's Gunman: Appears early on as a successful enka singer who works with Friend, Later revealed that he's protecting Maruo and helping the La Résistance covertly.
Stepford Smiler: Subverted when he turns out to be one of the good guys. Then you realize it's probably necessary to get close to Friend.
The Atoner: Left Kenji's band to join another and felt obligated to help him when the time comes.