[FairyKing]

1) I'll second the Sonic Arrow. Bows are probably my favorite type of Kamen Rider weapons, especially the ones that can also be wielded in melee, and of those the Sonic Arrow is the best IMO.

2) The Shingou Axe is such a silly idea, I mean it's based on a crosswalk light of all things, but it's one of my favorites for how they used it in the show, including the all-time best integration of a silly weapon phrase into a serious scene:

3) And lastly, the tragically underused Hamel Cane. I know Hibiki is the main series for musical weapons, but I love the Hamel Cane's design, and that once scene of Wiseman playing it while walking calmly towards a phantom just radiates coolness.