Michiru Kaioh (Yes it is spelled that way) is the Princess of Neptune, and lover to the magnificent Haruka Tenoh. Yes Haruka is truelly a female but in the manga she can change into a male and vice versa. Haruka and Michiru are always toghter and would die for each other. That's why they are my favorite couple. They repreasent love in one of it's puriest forms.
As Michiru Kaioh she is elegant, graceful, and very talented artist and musician. She tends to be very quiet but knows alot. She is as smart as Ami. IN my opinion.
But as Michiru turns to Sailorneptune she can be cruel and unloving as she was in the begging of S but she changed. Later the outer senshi begin to work with the inner senshi to fight galaxia.
Deep Submerge: Neptune generates a large ball of water and hurls it at her oppenent/target
Submarine Reflection: Neptune generates a large blast of water from her aqua mirror.
Neptune Crystal Power MAKE UP!: Michiru says this to transform into Super Sailor Neptune.