Sesshomaru characterization emotional motivation ideas
Sess is not cold and lying about his feelings but is rather emotionally immature instead of the tsundere/kudere tropes. As when he explains reasons for protecting someone during character development he explains it as protecting his own honor. Since he is also a pretty honest and emotionally driven character up until points like these (such as when Rin got kidnapped by Kagura ect) I’d like to think that instead of lying that he doesn’t care, he experiences empathy by misinterpreting it as his own pain and acts out in that way. As the reactions seen such as “she is my ward how dare you think you can do this to someone you know who is under my care
Sesshomaru as being emotionally inexperienced and misinterpreting signals and context is fun in character exploration and development. This seems to be cleared up more after Kagura’s and Rin’s death later when he realized he was feeling pain for another person.
I don’t think that his misinterpretations would be immediately solved after this point, he’d have to figure at what point he should care for others and at what point he should care for himself. (Such as the leaving Rin with a human village would be his own guilt in letting her die). So him reacting post series could still have leftovers of this. Because even though now he knows that he has this emotional capacity it doesn’t mean it’s instantaneous.
Talking about this is interesting, I highly recommend it.