Name's the Same: Senran Kagura borrows a lot of names common to Ninja legends. But this entry is not about that. The ending theme of the anime adaptation is titled Fighting Dreamer, which is one word shy of an opening theme of a certain famous ninja anime.
Trolling Creator: We have Takaki to thank for the cognitive dissonance of the franchise: half slices-of-life/moe comedy and big breasts, and half serious view on the world of shinobis. Three guess on which half is pointed to by the marketing?
This dichotomy may have its sources in the videogame staff: While producer Takaki is the most enthusiastic one for promoting fanservice content in the franchise, author Yukinori Kitajima (who penned the original story) is known for his taste for stories who can sometimes border on the dark and edgy (428, and he collaborated on the scenario of Nine Hours, Nine Persons, Nine Doors; obviously, Okamiden doesn't count).