Lye Batenkaitos/Relationships

Louis Arneb
Lye shows some degree of care, as she is his younger sister. He repeatedly went out of his way to arrange meals for her, allowing her to experience the lives of others just like himself and Roy. In both arcs 5 and 6, he's also shown to be somewhat protective of her; at some point even saving her life by overtaking "her" body and dodging Ram's attack which would have been fatal. It is unknown if he's aware of his sister's hatred towards him.

Roy Alphard
Similarly to his relationship with Louis, Lye shares a relatively one-sided love for his brother. He cares for him although not on the same level as he cares for Louis, and can be repeatedly seen criticizing Roy's decisions and his view on his approach towards his meals. Although it's worth noting every Sin Archbishop harbors hatred towards his fellow "brothers in arms"; having said that, comparing his relationship with both Roy and Louis is far from hostile.

Natsuki Subaru
Lye holds Subaru in very high regards and thinks very fondly of him due to various reasons. He's the only known exception to the Authority of Gluttony and has experienced death more than once; Lye sees this as a big opportunity to satisfy his own cravings as Subaru would bring a lot of unknown new flavors - Natsuki Subaru is the very finest dish Lye could hope for. On top of that, Lye's emotions are highly influenced by Rem's, which resulted in him thinking very fondly of Subaru.

Subaru, on the other hands, holds nothing but hatred towards Lye for consuming Rem's name and memories, thus erasing her existence from the world.

Regulus Corneas
Lye had a rather non-hostile relationship with Regulus. Both hated each other but they respected their views and rights, with Regulus perhaps being a bit too pushy, questioning his never ending hunger which resulted in Lye snapping back at him, stating he dislikes lectures. In the end, they never became hostile towards each other; Regulus even helped Lye take out Rem.

Reid Astrea
Lye and Reid share an extremely hostile relationship. Reid usually doesn't care about him and showers him with insults like "filthy midget-chan" while Lye tries to come up with an explanation to why Reid is able to descend from his floor, before rethinking his strategy and ultimately deciding on eating him, which always ends with Lye getting beaten into a pulp and Louis taking over his body. Interestingly enough, not even Lye is able to establish a "normal" conversation with Reid.