Academic Athlete: Implied; she correctly identifies two fields as making one frame in episode 1, and in the next episode she claims to have studied German when she was younger. As demonstrated in episode 4 and later, she seems to know more German than you'd expect from someone like her.
Gratuitous English: In the Japanese version, she prefaces false attributions to Confucius with "Confucius say"; however, the English version, oddly enough, renders it as "The Master said", which is more likely to appear before actual Confucius quotes.
Megumi: Why the hell did you do that!? San: Come on, Miss Toyoda wanted to see something out of you. Megumi: Well, she did... and I don't like it! Never do that again!
Nobody Calls Me Chicken: In episode 10, after Prima challenges her to a wrestling match, and she initially refuses under the belief that she'd be thrashed if she tried to wrestle an acrobat. This shortly gets proven wrong.
OOC Is Serious Business: She's a Tomboy with a Girly Streak as it is, but any time she acts more feminine than usual, it's a sign that she's worried and/or something terrible has happened, almost happened (for example, immediately after surviving an attempt on her life in episode 15), or is about to happen. The symptoms that come up:
She'll start speaking in a more formal tone of voice. In the Japanese version, this is always accompanied by her using "watashi" even in casual conversation.
She'll hold her ponytail in place with a pink bow.
When cooking, she wears a pink apron over whatever outfit she happens to be wearing at the time.
Her summer casual outfit, which is just subtly feminine (as it incorporates a camisole top instead of a tank top), has pink all over it, except for the shorts.
Her figure skating outfit, though one of the least feminine among the outfits worn by the Cures and their friends to the skating rink, incorporates pink tights, and she proves to be one of the best in the group.
Precision F-Strike: In episode 12, she utters the only F word in the entire series when Binarius confronts her and Ken, thinking it would be easy to capture Ken in his funk. Turns out, they won't have any of it.
Megumi: Ken may not be the most self-confident, but at least he doesn't know when to give up, and neither do I! Binarius: Really? You think you can beat me when your partner doesn't have the will to fight? Megumi: We're just paying you back with interest. [flips Binarius off] So have at thee, fucker.
Stock British Phrases: She'll sometimes say such things as "blimey", "bloody hell", "bugger", "chocks away", "flat", "frightfully", "good show", "I say", "smashing", "sod", "tosser", and "what's all this, then?" in the English dub. This'll sometimes cross over into Did Not Do the Bloody Research territory.
Suddenly Always Knew That: She's stated to have studied German in episode 2, and it's initially taken to be a joke, but come episode 4, it's shown she wasn't kidding.
Tights Under Shorts: As Cure Red. She also does it at the skating rink in a later episode, as well as with her cheerleader costume in episodes 11 and 25.
Tomboy with a Girly Streak: She's got a soft spot for sweets and "cute and cuddly animals", and she's also good at cooking, to the point where she's the Team Chef to the school's karate squad. She also likes the color pink. Oh, and she's got one of the best Moe faces in the entire series, which particularly shows when she's squeeing over something.
Town Girls: The butch to Chiyoko's neither and San's femme.
The Worf Effect: For her first rematch against Prima, she's KO'd effortlessly, just to show that Prima wasn't just, as San put it after the initial fight, "all bark and no bite". To be fair, she wasasking for it.
Suddenly Always Knew That: Apart from his fluency in German being revealed in episode 4, he's revealed to be skilled at rhythmic gymnastics in episode 12; while it's revealed by his father beforehand in the same episode, it's meant to be taken as an exaggeration of his effeminate tendencies to shut his homeroom teacher up... until he shows his skills in a fight against Binarius later in the episode.
Girly Bruiser: In episode 7, she shows that even someone as sweet and feminine as she is can really hold her own against the enemy, and not just with such things as distractions, as Prima found out the hard way after both Cures fell victim to The Worf Effect.
Good Is Not Soft: Episode 7 shows her curb-stomping Prima effortlessly after Pretty Cure gets Worfed.
Even Evil Has Standards: She starts to have second thoughts about serving the Deuce of Spades as soon as Binarius boasts about how he broke the heir to Ichida Private Academy, which is a contributory factor to her infiltration of the school as a student. The second thoughts only start to intensify when Megumi has a close brush with death in an incinerator in episode 15.
Gratuitous German: She speaks nothing but when fighting the Cures, under the assumption that they can't understand a single word she's saying. Oops.