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Okay so, I went through and counted up all the auxiliary Wonder Ride Books because I thought there would be less now that we have more riders, but no apparently we're getting at least 9:

1. Peter Fantasista
2. Jackun-to-Domamenoki
3. Needle Hedgehog
4. Storm Eagle
5. Kobuta 3 Kyodai
6. Tenkuu no Pegasus
7. Rock Band of Bremen (my favorite name of the bunch)
8. Saiyuu Journey
9. Tri-Cerberus

Moving on, our inital riders consist of: Saber, Blades, and Espada, who all use the Seiken Swordriver with different emblems in the sword. Followed by Kenzan, Buster, and Slash, who all apparently use a different kind of sword for transforming (implying the toys might not just be repaints of each other):
- Dogouken Gekidou/ Genbu Shinwa WRB
- Fusouken Hayate/ Sarutobi Ninja-den WRB
- Juuseiken Shion/ Hansel-natsu and Gretel WRB

Lastly, there's Calibur, who uses the Jaken CaliburDriver, and it appears that you can either get it in a set with the Jaaku Dragon WRB and buy the Ja-Ou WRB sold seperately. Or skip the Jaaku Dragon WRB entirely and just buy the Jaken CailburDriver in a set with the Ja-Ou WRB.