Even if you were to give him Fear Inducement, it's highly inconsistent.
For starters, he didn't scare off Sanzu and Hanma.
This is pure Social Influencing and no Paralysis Inducement, it basically happened a single time with South, and that too when South was incredibly damaged and possibly even Socially Influenced. People like Chifuyu and Senju were ready to fight against Mikey's gang and Mikey, which basically means that they aren't induced with fear as well. If you give Mikey Fear Inducement, all of these will have Resistance to it, which would be like trying to give other characters an ability which they don't have just to give Mikey an ability which he himself shouldn't have.