It has been a tradition that every Splatoon game has received a total of 3 sets of Amiibos associated with it, totaling 8 Amiibos each game.
For Splatoon:
First set: Inkling Girl, Inkling Boy, Inkling Squid.
Second set: Recolors of the first three with the same exact gear offered.
Third set: Squid Sisters.
For Splatoon 2:
First set: Inkling Girl, Inkling Boy, Inkling Squid.
Second set: Octoling Girl, Octoling Boy, Octoling Octopus.
Third set: Off the Hook.
For Splatoon 3
First set: Inkling (Girl), Octoling (Boy), Smallfry.
Second set: Deep Cut.
Third set: ???
If Splatoon 3 gets another set of Amiibos, it would only be a set of two, not three, mainly because Splatoon 3 already has two sets of three Amiibos. As for what that set of two is, I'm guessing it would be the two versions of Agent 8 wearing the Order Set. I don't see Acht getting one for the same reason why Craig Cuttlefish and DJ Octavio didn't get one, as all three of them are characters who are single-player only and have no ties to the multiplayer at all, not even as news hosts or anything.
For Splatoon:
First set: Inkling Girl, Inkling Boy, Inkling Squid.
Second set: Recolors of the first three with the same exact gear offered.
Third set: Squid Sisters.
For Splatoon 2:
First set: Inkling Girl, Inkling Boy, Inkling Squid.
Second set: Octoling Girl, Octoling Boy, Octoling Octopus.
Third set: Off the Hook.
For Splatoon 3
First set: Inkling (Girl), Octoling (Boy), Smallfry.
Second set: Deep Cut.
Third set: ???
If Splatoon 3 gets another set of Amiibos, it would only be a set of two, not three, mainly because Splatoon 3 already has two sets of three Amiibos. As for what that set of two is, I'm guessing it would be the two versions of Agent 8 wearing the Order Set. I don't see Acht getting one for the same reason why Craig Cuttlefish and DJ Octavio didn't get one, as all three of them are characters who are single-player only and have no ties to the multiplayer at all, not even as news hosts or anything.