Akane Tendo (Ranma 1/2)

Akane Tendou (天道 あかね Tendō Akane) is the leading female and deuteragonist of Ranma ½. She is the youngest of Soun Tendo's three daughters and one of the heirs to the Anything Goes School of Martial Arts.

Sadly, she is awfully scripted throughout the series, especially in the anime's early episodes.

Bad Qualities

 * 1) While not entirely confirmed, she can be abusive to Ranma even when he's telling the truth. For example, in episode 10 she beats up Ranma because she thinks that he was being a creep, even though he is trying to get P-chan back to his original human form. This happens so often that we're surprised Ranma hasn't broken up with her yet, despite having other "secondary love interests" (or "love rivals" in Akane's case) such as Shampoo and Ukiyo.
 * 2) She can get salty for the pettiest reasons. In one episode, she gets spiteful when Ranma pointed out her flaws by saying She's always stubborn & get angry all the time., proving she can't take criticism.
 * 3) She labels Ranma a pervert even though it's not intentional. In the first episode, when she finds out that Ranma is in fact truly male, she became furious upon realizing that a boy actually beat her instead of a girl. They also unwillingly saw each other naked in the bathroom, thus calling him a pervert even though she went the bathroom when Ranma was already there, so wouldn't that make her the pervert? She even tries to justifies this by claiming "it’s different when a girl sees a boy".
 * 4) She rarely ever gets punished for her actions.
 * 5) In her first appearance, it is revealed that she hates boys, which is not a good first impression of her character.
 * 6) She is overly possessive as she gets furious and sometimes hits Ranma just because he happens to be with different girl other than herself, especially when she can’t even admit she likes Ranma. So wouldn’t it instead make sense to get mad at the females who come in contact with him?
 * 7) At times, she is even shown to be rather controlling and domineering towards Ranma, especially in the anime's filler episodes. Like in one filler episode of Season 3 when Ranma suffers from amnesia which is caused by Akane and starts acting all girly, she forces the "girlified" Ranma (especially in her female form) to lay off his girlish qualities throughout most of the episode because of how Ranma's female side "is making her sick", even telling female Ranma off for crying even though Akane's controlling demeanor is the reason why female Ranma was crying in the first place!
 * 8) She's a poorly written tsundere character which lead by one of The Mean Popular Girls like Sakura Haruno, Amy Rose, etc.

Good Qualities

 * 1) She is way better in the manga as she is a more calm and civil person and doesn’t get violent as much as she does in the anime, since in the anime she unfortunately suffered from minor flanderization to be a bit more violent and aggressive than in the manga, especially in the early seasons.
 * 2) Sometimes, she is decent and not mean-spirited.
 * 3) She sometimes has a reason to be angry especially since Ranma isn’t entirely innocent either.
 * 4) Her design is cute.
 * 5) Deep down, she does care about Ranma.
 * 6) She does have a reason to dislike boys, given how she was attacked by all of the boys of her school every morning because they thought they'd be able to date her if they defeated her.
 * 7) She goes through some decent character development, becoming less overly-hateful and mean-spirited as the series progresses and even does save Ranma's life twice.
 * 8) Ranma ½ would likely not be as great as it is without her.

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Yes, she has her own theme song, which describes what her character is like.