In Zeta, he's a ferocious Titanswar maniac whose skills allow him to go at it on par with multiple powerful Newtypes like Kamille Bidan and anihilate his enemies with ease, causing the demise of several members of the AEUG(including Katz Kobayashi, Henken Bekkener and Emma Sheen).
He is most known for piloting the Gaplant and the Hambrabi, from which he utters his infamous quote at Bidan.
However, his fate drastically turns in ZZ, as his attempts at stealing the Zeta Gundam end up foiled repeatedly by Judau Ashta, and the former ace of the Titans ends up left on the junker colony of Shangri-La, empoverished and in rags. A popular fan theory regarding Yazan's change in conduct explains that the long stasis inside his MS escape capsule caused momentary brain damage on him and dementia due to lack of oxygen, just like how it had happened to Tem Ray years before.
Years later he apparently recuperates and rejoins the Earth Federation. Yazan appears during the events of the manga MSV-R: The Return of Johnny Ridden as the captain of the EF Forces' MS squadron "Knight Jaeger", around the year 0090 of the Universal Century (2 years after ZZ), under the pseudonym "Vasuki" (the name of Nagaraja, the king of the serpent gods in India). During this period he now pilots a heavily customized and revamped GM Night Seeker modified for close quarters combat and armed with a Fedayeen beam rifle (like the one he used in the Hambrabi).
