Doraemon is attracted to cats and has formed romantic relationships with a few.
One of them is Mii-chan. Doraemon mentions going on dates with her multiple times (ex. 半分おでかけ雲, 1987 manga story; セルフアラーム, 1989 manga story).
Source: なかまバッジ, 1987 (manga)
Another of Doraemon’s dates who has appeared more than once is Tama-chan.
Source: 大予言・地球の滅びる日, 1984 (manga)
Source: ドラえもんに休日を！！, 1984 (manga)
In the 1979 anime, Mii-chan and Tama-chan are merged as one character, Mii-chan.
Doraemon has been shown dating a third, unnamed cat. She looks unimpressed, maybe because he was late for their date.
Source: のぞき穴ボード, 1983 (manga)
Doraemon had a love interest in the 22nd Century, a cat robot named Noramyako. The exact relationship between the two of them varies by adaptation, but in the most commonly reprinted manga short that shows Noramyako, she was Doraemon’s girlfriend. She burst into laughter when she saw how Doraemon looked after he lost his ears, which probably put a downer on their relationship.
Source: ドラえもん大事典, 1976 (manga)
Doraemon has fallen in love with many other cats, but failed to start a romance with them for some reason or another. One story has him working up the courage to speak to a white cat sitting on a rooftop nearby. In the end, he befriends her successfully, but the manga doesn’t mention her again.
Source: 好きでたまらニャい, 1971 (manga)
Another time, Doraemon becomes infatuated with a pampered Persian cat. Again, he manages to befriend her, only to find out that she is already interested in a different cat, a stray. Doraemon is enraged, but agrees to help the lovers find a way to be together after hearing the Persian refer to him as a dear friend who can do anything.
Source: 恋するドラえもん, 1982 (manga)
Once Doraemon fell in love with a toy cat, which he calls Mii-chan (not the same character as the actual cat Mii-chan mentioned above). Doraemon uses gadgets to bring Mii-chan to life, but is devastated to learn that Mii-chan is actually male.
Source: すてきなミイちゃん, 1973 (manga) [colorized version shown]
The anime has introduced even more love interests for Doraemon. One is Sharmee, a humanoid cat from a nation of intelligent cats and dogs that Nobita founded.
Source: Nobita in the Wan-Nyan Spacetime Odyssey, 2004
Another is Belle, also a cat robot from the 22nd Century. Unfortunately for Doraemon, she turns out to be engaged.
Source: ドラえもんの青い涙, 2008 (episode from 2005 anime)
Doraemon is mesmerized by Mia, a celebrity cat who appears in ads on TV. Nobita uses the “Advance Diary” (あらかじめ日記) to let Doraemon spend a day with her.
Source: ドラえもんのたった一日の恋, 2011 (episode from 2005 anime)
There’s also Luna, a cat Doraemon meets while she is singing on a rooftop at night. She ends up moving out of the country, but Doraemon helps her reunite with a childhood friend.
Source: 青い月夜のリサイタル, 2014 (episode from 2005 anime)
