That is the core of my disappointment.
Hearing Imu speaks, he/she/it/they sounds like your every day run of the mill villain with basic arrogance.
It doesn't feel like I am hearing God or King of the World speak, Mihawk's words sound more impactful that Imus.
To portray a God like character, least Oda could have done is take some notes from Kishimoto, on how he portrayed Sage of Six paths, Kaguya etc.
Tho best thing to do would be take some notes from mythology since Oda loves Hinduism and Buddhism reference. Read some ancient texts like Mahabharrata, Ramayan, maybe some Greek and Norse mythology.
Imu literally sounds like a typical One Piece villain.
And that's disappointing.
He shouldn't be your run of the mill Mythical Zoan, his words, his conflicts shouldn't be like your average evil pirate or corrupt Marine.