In the world of comics you get the benefit of having cornucopia of characters. Some are fairly new but when dealing with Marvel and DC, some of them have been around for a very long time. As such they are subject to the hands and voices of different writers, editors and artists. Often times those said characters can take many different shapes and forms. Deathstroke: The Terminator, aka Slade Wilson, is one of those characters.
He was introduced in The New Teen Titans back in 1980. He showed up in the second issue to help his son Grant Wilson, aka the Ravager capture or kill the Titans. Thus he has been one of the Titans main antagonists ever since. After leaving the military he defied orders to rescue his friend Wintergreen, who had been sent on a suicide mission. Slade became a mercenary for hire but kept it a secret from his family until his son was kidnapped by a villain named The Jackal. Using his younger son Joseph as leverage, The Jackal demanded Slade to tell him the name of the person who hired him as an assassin. Slade refused because it’s against his code of honor. Joesph’s throat was slit destroying his vocal cords, leaving him a mute. Pissed that Slade let this happen to her son, Slade’s wife, Adeline who has some military traing of her own, takes Slade’s right eye.