Spoiler
this set is:
1) [Character from spinoff]
2) Hakubi (Keiwa's sister, for anyone who didn't know her Rider name yet)
3) Groovy (the dog guy who had Ninja for 5 seconds before Buffa beat him up)
4) Letter (who probably should've been in the previous set imo)
5) cracked Nudge Sparrow
6+7) don't know what their names are, if they even have them, but the Mouse/Rat and Beaver(?) Core IDs used by the two remote control Riders the Glares used
8 ) Buffa's friend's Core ID (normal version, so maybe there'll be a set 3 where we get the cracked version of this and Letter?)
9+10) Ben and John's Core IDs