She is a rare one. One of a kind. Truly a beautiful person inside and out. The elusive Onesha is one that you will be incredibly lucky if you ever meet one. If you do, don't ever let go. She will be the best friend you will ever have. You will be so glad you ever were blessed to know her.
Oneshipper is a term that refers when someone ships a singular ship while their stay in a fandom, and has/shows some kind of "loyalty" to it. They are the reason of the so called "ship wars" inside fandoms, and may or not be obsessive when it comes to their "OTP".
"This new ship is quite cool!"
"Yeah, but I can't like it. Im loyal to my ship."
"You're such a oneshipper."