Dandy Step

They’re consistently depicted as ‘couples’. A.B.A and Paracelsus as an actual in game battle couple, while Sharon is on the sidelines but is very much present with Slayer prefight, post-fight etc.

Slayer as a Nightwalker also hungers and gains power from blood similar to Paracelsus, tho whether he NEEDS blood to survive I’m unsure (I think Nago survived hibernation without drinking blood so that would be similar to Para who survived 20 years not drinking blood).

Slayer has been able to satiate his own hunger without hurting/killing other people because Sharon is deathless and is a willing endless supply of blood for him. Paracelsus was provided blood by A.B.A tho not directly her own blood (usually), but also, it’s implied her being a homunculus made her tough enough to survive longer than usual as Paracelsus’ wielder. Paracelsus got over his desire of blood by choice though, whereas Slayer simply has an easy endless source of it.

Because of the above point, Slayer is actually really friendly to everyone and peace-loving despite his overwhelming power. He was disappointed with young Paracelsus who he felt was a bore and waste of time for being focused on killing and violence. Afterwards, Paracelsus would recognize that Slayer only wants peace when they next meet while Slayer realized he was already suppressing his power. By STRIVE, Paracelsus has adopted a philosophy close to pacifism as he never actively wants to fight or transform anymore.

Slayer has been alive for a very long time (longer than most of the cast if not all of them, even That Man) and Sharon cannot die, so they are eternal lovers. Similarly, A.B.A has said her and Paracelsus’ “love is eternal”. As Para is a magical foci and A.B.A is likely to be immortal or at least extremely long lived, this may also be their fate where they cannot die naturally. Bit iffy on A.B.A since her hair is actually growing, but whether she ages at all is another thing.

And Slayer can be possessive of Sharon in almost the same exact scenarios and in the same ways as A.B.A:

Getting jealous of himself, getting jealous of other people eyeing Sharon, and believing in obsession being a form of love, which explains SO MUCH about why he was so helpful with helping A.B.A contact the right people to put Paracelsus in a body.

And Sharon goes bonkers jealous over Slayer too.