These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Ikki Tousen
Ensemble Darkhorse: Kan'u is pretty popular... hell, sometimes all of the Seitou (Shu) characters (Kanu, Ryuubi, Chouhi, Koumei...) are considered more popular than the Nanyou (Wu) characters.
Fetish Retardant: The series' fanservice is a doubledge sword. While it can attract fans, several commented they quited because of it.
Fridge Brilliance: The initals of the subtitles of each series after the first season (DD, GG, XX) could be indicative of bra sizes.
Les Yay: Everywhere, and quite a bit of it centered on Ryoufu and Kan'u.