Deep Web Underground is a mysterious and enigmatic character from the anime series 'Kizuna AI: Aituber'. Known for their shadowy presence and deep knowledge of the digital world, they play a pivotal role in the series as an antagonist operating behind the scenes. With a complex personality, they are both a formidable hacker and a strategist, often challenging the protagonist, Kizuna AI, with cryptic messages and digital traps. Their true motives remain shrouded in secrecy, adding tension and intrigue as the series unfolds, keeping viewers guessing about their next move.