Makoto Kino
Makoto, or Mako-chan, as everyone calls her, has a pretty tragic childhood. She lives alone in an apartment because her parents were killed in an airplane crash, hence her trouble with airplanes. She had problems in her old school and left, and rumors were spread about her beating up a kid, so no one would be her friend... Except Usagi, who is attracted to her bento lunch and is impressed by her strength, cooking skills, and cuteness, so they become fast friends.
Usagi takes Makoto to the video arcade after meeting her when school is over for the day. While there, Makoto sees a boy, Joe, who is extremely talented at the UFO catcher game, winning anything he wants. Makoto thinks him to be like her senpai, so she immediately thinks he's cute. She therefore follows him when he leaves. Joe is one of the seven original youma of the Dark Kingdom, and when Zoisite attacks him for his rainbow crystal, Makoto defends Joe. Joe is considerably callous to Makoto, saying he doesn't like how she's so tall and unfeminine, and he admits to her that he has a special telekinetic power that enables him to cheat at the UFO catching. Zoisite attacks once more, and Joe flees, and Makoto, in anger at his comments about her, chases after.
Zoisite takes Joe's crystal, and he turns into a youma. The youma goes after Makoto, but Sailor Moon intervenes, though somehow she manages to be caught by the enemy. Luna, at this point, gives Makoto her henshin stick after seeing the sign of Jupiter flash on Mako's forehead. The brunette then transforms and saves Sailor Moon, thus joining the Sailor Team as the fourth senshi.
Makoto is a semi-paradox sort of girl. While she is somewhat tough and has a quick temper, she enjoys cleaning, cooking, and "feminine" activities. She is constantly attracted to a new boy, whom she claims always looks like her senpai. She is constantly being taken advantage of by this fault- in the first season, a possessed ice skater believes her to be a Sailor Senshi, so uses his charm on her; in SuperS, Tigers-eye treats her incredibly cruelly but she accepts it because she is so infatuated with him. Some people have accused her of being bisexual because she chases Haruka around in one SMS episode, but that was only because she deeply admired Haruka.