Herc, known as Tio (ティオ) in the Japanese version, is a character in the Yu-Gi-Oh! ARC-V anime. He is an elite Duelist and employee of the Leo Corporation, and in charge of investigating Marco's disappearance.
Tio (spelled as "tío") means "uncle" in Spanish, but also means "dude" or "guy" in some contexts. Herc may be short for Hercules, a possible reference to Herc's somewhat muscular body.
Pre-Arc League Championship
Herc met with Declan and Henrietta Akaba regarding the disappearance of Marco, and presented to them Marco's Duel Disk and cards that his team found at the site of the incident. Later on, he met Julia, Dipper, and Kit at the site of Marco's disappearance where they were searching for clues regarding his attack. He was evasive but polite to the students, telling them that evidence was still being gathered and that they should continue their studies.