Ai Haibara Relationship analysis

Conan Edogawa

Ai Haibara seems to have somewhat romantic feelings for Conan/Shinichi, although she never truly admits to it. In the fourth movie, she says to Conan that she wished she could forget her memories about the Black Organization and the death of her sister and the pill, claiming that all she wants to be was a normal little girl and live together with Conan forever. But then as Conan was shocked by the words, Ai immediately said she was lying. Indeed, it is a mystery just exactly what she feels for him, whether friend or otherwise. It could be said that, because of their almost equal level of intelligence, she finds it easier to talk to him.

Ran Mouri

There are instances where Haibara will caution Conan from actions that involve Ran, though it's assumed this is due merely to the fact that she wants to keep her identity hidden. At one point, she was very cold and distant towards Ran, just like she was to most other people. Ran believed that it was because that Haibara had hated her. However, later that day, Haibara finally properly introduced herself to Ran, and they slowly became friends. Haibara finds that Ran resembles her older sister, Akemi Miyano, so she takes special interest in protecting her.
These feelings began after Ran jumped through a slew of bullets from Vermouth to save Haibara. Haibara immediately thought of her own sister, and began to treat and look at Ran as a spitting image of Akemi. Haibara also begs for Ran to stay at Agasa's house, during when she had learned that Korn, Chianti, and the rest of the Black Organization were lurking about, immediately thinking of her own sister's death, and wanting to keep Ran safe.

Ayumi Yoshida

Haibara has tried to keep an emotional distance away from the rest of the Detective Boys since the beginning. However, over time, she can't resist their friendliness anymore and gradually warms up to them.

This is especially true in the case of Ayumi. At one time, Ayumi noticed that she called everyone by their first names except for Haibara and decided to try and call her Ai-chan, but without success. At the end of a case which involved a shattered friendship, Haibara told Ayumi that it was ok for her to call her Ai-chan. When Mitsuhiko and Genta tried to call her that, however, she told them that only Ayumi was allowed to call her by her first name.On the whole, Ai seems to see Ayumi as a little sister, even going so far as to physically shield her from danger.

Mitsuhiko Tsuburaya

Mitsuhiko develops heavy romantic feelings for Ai, and Ai is aware of this. Ai uses his feelings to her advantage when she needs him to do something, but she also does admire his courage during missions the Detective Boys must perform and respects his feelings enough as not to be truly exploitative.

Hiroshi Agasa

The relationship between Ai and Professor Agasa is rather unusual, if not humorous. Despite what their actual ages are, Ai often times acts more like a mother to the professor, constantly reminding him to watch what he eats. On several occassions, she has removed fattening foods from his reach, and is attempting to help get him into better shape. There's also been instances where she'll automatically step in front of Agasa in cases of danger.
Out of all the people she's met, Ai seems most comfortable about acting herself with the Professor; which might be attributed to the fact that he was the one who found her after she escaped the BO, and took her in.