Nature and identity with 性
性 means nature, characteristic, or sex. It refers to what is innate to a person or thing.
Etymology
This kanji is an ideogram built from 忄 (heart) and 生 (birth), giving the sense of what is innate or born into a thing.
Compatibility
相性 (Compatibility)
相性 means compatibility between people or things, whether their qualities work well together.
It combines 相 (mutual) with 性 (nature) to show the nature between two things (their compatibility).

At the school festival, Ayumu and Urushi stop by the affinity fortune telling booth while Maki is on duty. Maki holds out a box with an opening on top, and says the need to pull out a single card together.
- マキ:
- 「0〜100の点数
( が書( いてるからそれで相性( がわかるんだよ」- “Your compatibility is determined by the score written from 0 to 100.”
- 「もちろん100点
( が一番( いいやつ」- “”
- “Your compatibility is determined by the score written from 0 to 100.”
- 歩
( : - 「二人
( でですか?」- “Together?”
Gender
女性 (Woman)
女性
It combines 女 (woman) with 性 (sex) to show the female sex.

During a hide-and-seek game at the park, Ayumi hides in a car trunk and falls asleep. She wakes to find the car moving and discovers a bag of money, a slimy saw, and what seems like a severed head. Conan, tracking her via their Detective Boys badges, prepares to pursue on his electric skateboard. Genta and Mitsuhiko join him on it, but Conan urges them to stay behind due to the danger.
- 元太
( : - 「歩美
( が危( ない目( にあってんのに、じっとしてられっかよ!!」- “Ayumi is in danger, so how can I just stand by and do nothing?”
- 光彦
( : - 「そうですよ!! 女性
( をお守( りするのは男( の義務( ですからね!!」- “That's right! It's a man's duty to protect women!”
男性 (Man)
男性
It combines 男 (man) with 性 (sex) to show the male sex.

Detective Mouri is invited as a special guest to the birthday party for Reika, daughter of the Yotsui Group’s chairman. At the event, Reika announces her intent to marry.
- 霊化
( : - 「そう思
( って今日( のパーティーにも、有能( そうな男性( を数人( 、お招( きしてますわ…」- “With that in mind, I've invited several promising gentlemen to today's party...”
異性 (Opposite sex)
異性
It combines 異 (other) with 性 (sex) to show the other sex.

During a ninja training exercise, Tsubaki disguises herself as the teacher’s assistant in the hope of getting close enough to take the teacher’s mask. When the teacher unknowingly reveals that keeping boys and girls separate has been aided by lying to the female ninjas about men being scary, Tsubaki accidentally drops her disguise. The teacher has no choice but to take Tsubaki into her confidence and explain the reason for the separation, starting with the word “love”, of which Tsubaki is unfamiliar.
- ハナ先生
( : - 「異性
( に好( きという思( いを寄( せることだ。」- “It means harboring feelings of affection for someone of the opposite sex.”
- 「年頃
( になると皆( 経験( すると聞( く。」- “I hear that everyone goes through this when they reach a certain age.”
- “It means harboring feelings of affection for someone of the opposite sex.”
Qualities
性能 (Performance)
性能
It combines 性 (nature) with 能 (ability) to show inherent capability or performance characteristics.

Professor Agasa gives Conan a tracking device. He eagerly looks for an opportunity to see how it works.
- コナン:
- 「そうだ!蘭
( に付( けてこれの性能( 試( してみっか!!」- “I know! I'll stick it on Ran and see how it performs!!”