Goro

Goro was a former criminal, stealing priceless artwork from museums. Some time between the flashback in Episode 1 and the current point in Episode 1, Goro had "changed their ways" and "left theft behind them,” investing in the business NYAMCO and becoming a businessman.

Personality
Goro is the greedy type, committing major theft for profit. They also come off as quite irresponsible, not contacting security when such matters require. Though Mappy can easily see through their many tricks, Goro is still quite clever and thinks things through to the very end; they are a completionist (Mappy says so himself).

Goro is often shown having an "evil villian laugh" and frequently laughs throughout the series when something goes their way, even giving nervous laughter when things do not.

Relationships
Mappy: Goro remains longtime archenemies with Mappy, showing a very codependent rivalry, "... it was always about the journey, the chase. We're on a level no one else would be able to understand." (Episode 13), with Mappy always feeling that he could redeem himself by locking up Goro for good. Goro hired Mappy as NYAMCO security simply to get back to the "old days" and to continue their antics. They have a very shared history. Goro is Mappy's boss.

Goro seems to have an affection for Mappy, whether it be completely dependent, platonic, or other, and has on multiple occasions throughout the series slipped up and said things such as "I miss you," "you're my best friend," and "I love you" to Mappy, though denying and dismissing it immediately afterwards. Their reliance on Mappy may come from them wanting the thrill of crime and the necessity of someone having to go after them and try to stop them, just as Mappy had done in the "old days."