Alexandra Magritte, given her similarity to Maki Nishikino in terms of appearance.
Nyanko Big, due to the completely unexpected spotlight episode in Episode 3 wherein he narrates using the suave "voice in his heart" and gives his perspective on both his time with the Tada family and the quirks of the main cast, establishing the family cat as a snarky but well-meaning and insightful fluffball.
To a very, very minor extent: Prince Charles, who many fans viewed as a "royal bro" after he unhesitantly let Teresa stay with Mitsuyoshi as opposed to going through with their engagement.
Epileptic Trees: After the reveal of Teresa being set to wed Prince Charles after she returns to her hometown, many fans quickly pointed out the similarity to one ending from Boku Dake Ga Inai Machi (or Aldnoah.Zero) and especially Roman Holiday, leading them to assume that Mitsuyoshi would not have a happy ending with Teresa. Thankfully, this did not turn out to be the case.
Win Back the Crowd: After a number of unhappy endings to previous slice-of-life anime series, this show finally gave some hope to the skeptical fans who assumed that the main character would have a bad end.
