Kera Yuy

Credit goes to Sepharic
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Kera Yuy... a long time since I've drawn her
So she has a slight character change

She isn't Heero Yuy's twin sister (the original Kera Yuy is the original Heero Yuy's twin sister). This Kera is infact a no-name who was given the name Kera Yuy when she was young and trained as an assassin and a Gundam Pilot.
She is infact the younger sister of Zech's Merquise.

Also Kera's real hair colour is blonde (like Zechs) but is has been dyed to look like Heero Yuy's hair. Every now and again when having to stay in water the dye come out, also when she goes undercover she will remove the brown hairdye as no one recognises her with blonde hair apart from Zechs. Quatra is the only Gundam Pilot who knows her true appearance as he stumbled upon her before could fix it.

Her original Gundam was known as Sheath Star which has abilities of all 5 Gundam's. Her new Gundam is called Haven - it possesses the same abilities as Sheath Star plus extras. Sheath Star was left destroyed as it had become a target to steal and use against earth, so with the newer version under a different name is now is safe and belongs only to Kera again.

Kera Yuy's real name is also only known by Quatre Raberba Winner and Zechs Merquise... Her real name is Rei Merquise..
Rei being the Japanese for Zero as all Gundam pilots names are numbers

In Gundam Wing Frozen teardrop (a novel that is set 20years after Gundam Wing Endless Waltz) Kera Yuy is married to Instructor W AKA Quatre Raberba Winner

Gundam Wing, Quatre Raberba Winner, Zechs Merquise (c) Sunrise/Bandai/Sotsu Agency!
Kera Yuy / Rei Merquise (c) Me!