not that anyone outright asked for this but if i WAS ranking zac d20 PCs from most to least likely to be asexual:
ricky matsui. easily the most asexual by a landslide. for more information see this post
pib. too consumed with being a mischievous cat, not concerned at all about sex.
colin provolone. verrrryyy asexual. is only lower than pib on account of not being a cat.
norman "skip" takamori aka prince valdrinor. couldve been in a massive slug fuck fest and decided that wasnt his thing.
actual norman takamori. mightve had sex once or twice in life but generally preoccupied with (1) being the worst and (2) slug up there.
cumulous rocks. has autistic swag so he would probably fuck under the right circumstances but i don't think he's too pressed about it
canon lapin cadbury. might be gray-ace, more likely just a church guy who never really had the opportunity to fuck
squing. frankly i just dont think he SHOULD fuck, but this doesnt mean he wouldnt.
daisuke "pappy" bucklesby. could just as well be lying about all the sex he had with comfrey as telling the truth.
gorgug thistlespring. has canonically had sex before and enjoyed it, but is also queer in so many ways that he might be on the ace spectrum regardless.
time quangle lapin. is getting railed by arthur aguefort who he met on fantasy grindr