QCan I choose not to add the top card of my deck to my hand even if it is a Cute card?

AYes, you can. If you choose not to add it to your hand, return it to the top of your deck without revealing it.

QIf I summon Kyoko Igarashi [P.C.S.] and Miho Kohinata [P.C.S.] with Uzuki Shimamura [P.C.S.]'s Fanfare ability, in what order are their Fanfare abilities resolved?

AWhen multiple followers with Fanfare abilities are summoned with the same ability, you can resolve their triggered Fanfare abilities in any order.