I was reading the raw chapter when I realized Mephisto keep changing his first-pronounce(?) depending on the situation, he using Watashi in flashback, Ore in beach chapter, Boku in the last page and using three of them when he kick the throne after Delkira reject him. Too bad it can't translate properly in eng.😕
I really like the way Mephisto talk, he sounds like a playful but strict father. Like in the beach chapter, he let Iruma have the spotlight because he know Iruma can handle it. He only step in when things got dangerous.