ooh good question! i definitely headcanon neuvillette as being on the aroace spectrum (bi + demiromantic demisexual, usually), although how that presents depends on the universe or type of neuvifuri dynamic i’m picturing at the time.

when i think of them in a queerplatonic relationship, it’s not necessarily because of their orientations, but because i read their bond as something that goes deeper than romance, or any label. it leaves a lot of nice wiggle room to test out different headcanons, and it feels… how to phrase this… more intimate than a traditional romantic relationship, maybe? it adds some extra spice and warmth and comfort and tenderness. it’s a relationship that can be anything, and everything, all at once.

if you’re wondering, my usual headcanons are:
furina: bisexual, genderfluid. not aspec but needs a specific connection to want to act on the attraction she feels.
neuvillette: demiromantic, demisexual, agenderish but identifies as male-ish out of convenience (the only gender he really has is ‘dragon’.)

this ended up being… really long LOL but yes the short answer is arospec & aspec neuvillette who needs a specific kind of connection to move forward into attraction. thank you sm for asking, i love to ramble abt my headcanons <3