YMMV / Sister Princess

• Adaptation Displacement: Many viewers of the anime have no idea it was based on a series of light novels; some people also assume that the anime is based on the official Dating Sim, when the game is actually based on the novels as well.
• Base-Breaking Character: First impressions, you can't blame anyone in thinking that Taro Yamada is the most annoying character in the anime series, from making up things to make him look good and his off-putting interest towards the sisters, Taro's antics makes some viewers groan in disbelief. And at the same time, Taro is appreciated as one of the funniest acts in the anime series and being voiced by Kappei Yamaguchi helps a little bit.
• Designated Villain: Akio doesn't really do much at all, let alone anything villainous, but he's treated as such after the Wham Episode because he separates Wataru from his sisters.
• Ensemble Dark Horse:
  • Mami is pretty popular considering that she's not really one of the sisters.
  • Michael, Marie's dog, is adored by everyone.
• Ho Yay: With Wataru's regular emails to Akio and how he lights up after receiving a reply, and Akio convincing Wataru to return with him - which includes a Wall Pin of Love with Sexophone accompaniment - not to mention his reaction when Wataru returns to the Island, Akio's status as the Gay Option is apparent.
• Incest Yay Shipping: Given the nature of the work, this is not surprising. Fans pretty much ship Wataru with almost every one of his sisters, even the youngest...
• Once Original, Now Common: Due to being one of the earliest harem stories in the anime industry, as well as being one that would be a major basis for things like the Little Sister Heroine boom in the years to follow, it definitely comes across as a massive Cliché Storm that can't really hold up to many of the newer series out there.
• One-Scene Wonder: The Mysterious Man in Aria's A Day in the Limelight episode is fondly remembered as one of the few supernatural entities to make a presence in the anime. It helps that he is a person that Aria is very fond off outside her older brother and sisters.
• The Scrappy: While he is not hated persay, you'd be hard-pressed to find people who like Minai. This is due to the fact that Minai is nothing more than an undeveloped Foil to Wataru and his remarks upon Wataru's return is viewing him as nothing more than a rival and an obstacle, disregarding Wataru's genuine friendship for him.
• Unintentional Period Piece: The show's general enthusiasm about and fascination with e-mail pins it firmly to the late nineties and early 2000s. Also, one episode has the girls very excited to have Rinrin's latest technological breakthrough—a handheld device that allows them to send e-mails wirelessly.

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