One thing I love about Mob is despite only being one year apart, Ritsu really is like a baby brother in Mob’s eyes.
Mob’s protectiveness stretches far past the incident where he accidentally hurt Ritsu.
When talking about how much Ritsu wanted to be an esper, he said “When you were little.” instead of “When we were little.” To him it was Ritsu who was the little kid.
And he always loves putting emphasis on how Ritsu is his little brother, using it to emphasize that he is the older one, he is the one who has to look after Ritsu, Ritsu is the one he has to protect against all evils.
Plus he totally babies him
And it isn’t any lie.
Ritsu is naive, he’s still so young and cries to his brother if he sees a bug.
Ritsu is a good kid, as difficult as he can be he’s still just a kid, especially so in Mob’s eyes.
I have confidence that facing Ritsu will be Mob’s last straw against ???%