- Ensemble Dark Horse: Saigo Katsuyuki and Alice Uzuki, the latter being an anime-only character, are pretty popular and is hard not to ship them together.
- I Am Not Shazam: Momoko, the sayer of Koushi-dono, is not Sumomo, she is only Momoko. Try saying that fast!
- Jerkass Woobie: Koushi is truly a tragic tale being constantly pursued by assassins despite wanting nothing to do with martial arts or even having a talent for it. However that doesnt change the fact that his increasing Inferiority Superiority Complex causes him to be a jerkass to all of his friends who are just trying to help him. Not to mention the heartless way he treats Momoko despite her complete and utter devotion to him reaching the point where she is not only brought to tears, but a Heroic BSoD.
- Memetic Mutation:
- Moe: Momoko and later Iroha will sometimes shift into a Moe-blob when mooning over Koushi... which looks a little ridiculous when they're in various martial arts uniforms. Taken to a disturbing level when Unken Inuzuka, Koushi's father with a Heroic Build, becomes one in joy of his son's determination.
- Strawman Has a Point: Tenka Koganei has a point when he tells Kohai that with a string of deadly assassins after his head ignoring it and hoping it goes away is nothing short of Lethally Stupid. Especially since he doesnt even try to learn how to defend himself. His father also called him out on his stubborn refusal of learning how to defend himself
- Tear Jerker: Pretty much the entire last episode. Koushi and Momoko are both poisoned but there is only enough antidote for one person. Momoko passes out first and Koushi can't bring himself to take the antidote as he feels he's worthless. They are both found presumably dead by everyone else shortly thereafter but after a couple of moments Momoko is standing. Koushi, who thought Momoko was nothing but a nuisance the entire series, gave her the antidote and chose to die. Momoko's profound anger over losing Koushi causes her to go insane and put up a match for the Big Bad. Her sadness affects her fighting, though, and just as she's about to be killed, Koushi awakens and looks up. The Big Bad senses it and is distracted long enough for Momoko to finally successfully pull off her clan's ultimate martial arts technique. After the fight is over she is still sad, but as they turn Koushi over they see the poison is gone from his body and Momoko faints.
- What an Idiot!: The Inoue clan specializes in medicine, yet Moutatsu raised his daughter to be unable to tell the difference between men and women
YMMV / Sumomo Mo Momo Mo