>>50945243There's a limited edition of her most recent birthday merch that will be hand signed, but the Jigoku 6 EP is probably going to ship before that does. There was also a limited time frame to get a hand-signed copy of Shinigami Note
which pissed a lot of people off because it was announced months after preorders opened and most deadbeats already pre-ordered but that was initialed rather than fully signed; Mori said this will be her full signature.
The only signed merch I know of is the prizes for guessing the guests for her sololive (Saku got one, don't think I've seen any others posted)