Vicious

Vicious (ビシャス Bishasu )  was a member of the Red Dragon syndicate and veteran of the Titan War. He attempted a coup of the syndicate and became its leader briefly after the Van was murdered and before being killed by Spike Spiegel. He was known as a High-vlass assassin and a notorious murderer across the galaxy, even responsible for killing his own mentor, Yao Menrai. He's also known to be a drug dealer since he's well-renowned for selling and distributing Red Eye.

Recessional of the Red Dragons
He didn't appear during the fic, although he was mentioned several times throughout. He was first referred to as he was a subject during a resurecction ritual as his volatile blood was being drawn out of his body and was then inserted into the deceased Spike as a controlling agent and a way to stay loyal to the Red Dragons' new master.

It was through Vicious' blood ties that made Spike so agressive and erratic, as well as suordinate to the one who revived him, the syndicate's newer head, Master Kim Yokushimo. Vicious was also mentioned when Jet and Trudy met up with Laughing Bull and he gave Vicious the name, Striking Snake, as he's a sneaky, coldblooded creature that strikes without warning and has no recoil, in addition to sharing Spike's blood and is always on the prowl for revenge. He warned that if the Wandering Star, Trudy, doesn't realign the galaxy soon, Vicious' blood would consume Spike whole, and he'd be under his influence permanently. resulting the destruction of the entire galaxy much like the red ginat and supernova he saw in his vision.

Fortunately, Vicious' blood was vanquished once the war was over, and when Julia restored Spike after she was rescued by Zero and Zoroark back at Olympus Mons; however, there were still some faint traces of Vicious' blood in Spike's nervous system, resulting in his sporadic actions and being constantly watched over by Julia and Trudy.