Imu isnt expressive like Akainu.
Akainu had no rage against Luffy, just doing his job by wanting to eradicate Dragons bloodline. He tried to kill him quickly.
Imu on the other hand took his time torturing him, you cant tell me Akainu hates Luffy more then Imu does lol.
Imu didnt try to kill Luffy because he punched him what are you talking about, he came from MJ specifically to kill Nika/Luffy...
Except when Akainu see or know before luffy know him, he want to kill luffy baldy. Dragon leave marine by age 17 while Akainu join by age 23 so how they even meet each other. Only thing is wanted poster say dragon is most wanted man.
Imu do have expression face.
I say Imu went o kill luffy because luffy punch him. Yes Imu say it remind of joy boy sue similar face , not Imu hate luffy. It is more like he respect joy boy better than Luffy.
I would not say Imu torturing Luffy because he hated him, he want to kill him to make sure which from his ax to chop his head off. Then it is about ancient history about Joy Boy that Imu knew it.
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Akainu see luffy and want to kill him before luffy see him. All happen at Marineford
Imu is following his plan until base luffy punch his face, then that is what Imu hate him for it but not rage one