Im wondering if MC feels a little sad because of his undead status.
He doesnt feel that much pleasure, but he can adventure anytime he wants...
Also, the witch place, the witch herself, was a sensation, and he doesnt much enjoy her beauty because of his undead status (though i understand he treated her as a comrade and friend and not romantic target, but.......... but........ )
The only demerit i think for him is that, over time, friend will be gone and he is alive well and kicking...
The only merit he has, there are so many potentials in his undead status and is evolving, and the only pair i can for him as romantic target was the ELVES,,, yes the ELVES waifu