Rain Mikamura is a character that appears in Mobile Fighter G Gundam.

Rain is a kind yet clever and tough young woman who became Domon's closest ally and supporter. She's a brilliant mechanic and doctor. Though Rain had to put up with Domon's tough and hot-headed attitude, she still remained loyal and faithful to him. She was the one who took the photo of Domon and his family, which was later torn and used by him during his search for his brother Kyoji.

A compassionate and empathetic person, Rain never turns her back on those in need and always helps others. Such as Chibodee's crew when they get caught in the middle of an overflowing river and tends to their wounds, despite the fact that they stole Shining Gundam's combat data, showing that she never holds a grudge. Rain is also sympathetic towards those with unfortunate circumstances, especially Domon, openly crying at the fact that he has to fight and kill his own brother.

In addition to being a qualified doctor, she is also a talented woman who is capable of mechanic maintenance, espionage, and even piloting a Gundam.