Jumping in the middle of this conversation to say what frustrates me the most about Touhou games.
You know what I would LOVE to see in the main series? A new character introduced as a PLAYABLE character immediately. Almost every shmup series in creation does that, and we haven't had a new playable character to start off with since, like, Phantasmagoria games. Outside of the TSS-clone games, we haven't been introduced to a new PC since Touhou 01. Rin Satsuki could have been one of the best thing to happen to the series in this light, but instead, all we ever get are recycles. Look at this!
HRtP: Reimu (introduced!)
SoEW: Reimu (again)
-PoDD: Marisa and Mima (from the last game), alongside Ellen, Kotohime, Kana, Rikako, Chiyuri, and Yumemi ( Innovation! )
LLS: Reimu and Marisa (from previous games)
MS: Mima (from three earlier games) and Yuuka (from the last game)
EoSD: Reimu and Marisa (reset)
PCB: Sakuya (from the last game)
IN: Yukari, Alice, Youmu, Yuyuko, Remilia (from the last two games)
-PoFV: Everyone was from a previous game, except for Aya, Medicine, Komachi, and Shikieiki ( Innovation? :| )
MoF: Reimu and Marisa (reset... again, and Aya was a boss)
SA: Reimu and Marisa (with familiars that all appeared in previous games)
UFO: Sanae (from the last two games)
10D: Sanae and Youmu (from previous games)
Give us someone new off the bat, and let us experience them by seeing the world through their eyes. That's just me, though!