Sonshi busts out a pair of sai in #18, something that Yasuaki Kurata is known for. There's an old Hongkong movie where he goes with his sai against Sammo Hung who's armed with tennis rackets!And Sammo wins!
Aguri's Makai Knight title is Sky Bow Knight GAI. Junya Ikeda, who played Takeru, previously played the Sixth Ranger named Gai.
In addition, Aguri's main weapon is bow and arrow. Guess what weapon that Kamen Rider Duke (who was played by the same actor) have?