Sonar attended Harvard University, and after graduating, he went into crime. He orchestrated some of the most effective Silicon Valley investment frauds in US history. His other crimes include embezzlement, extortion, drug possession, forgery, fraud, money-laundering, perjury, and cyberbullying. During this period, he also became addicted to a variety of controlled substances. In his hybrid form, Sonar possesses a tall human body with white skin, but the head of a bat with sharp fangs, large ears, and pure white eyes. He has fluffy gray fur and a pink snout. He often wears a navy-blue suit with a red tie and black dress pants. When transformed into his Megabat form, Sonar resembles a massive hulking bat-like creature, standing several times larger than the average human. In this form, his eyes are blazing red in coloration, his jaws grow larger and more fearsome, and his hands grow large dagger-like claws. Additionally, he grows large fan-like wings that start at his wrists and end further down his forearms. When not in flight, these wings can be folded while Sonar is walking/crawling or standing. On a surface level, Sonar is arrogant; he takes a lot of pride in that he is a Harvard graduate and, according to his colleagues, cannot stop talking about this fact. He is also aloof. When he fails missions, he claims he wasn't trying as hard. Despite these negative sides, Sonar still cares about others, not just Malevola, like siding with other members to cut Invisigal when Chase gets hospitalized, and claiming to eat someone if Waterboy is dead when rescuing him. Additionally, he knows when to drop his ego, such as thanking Robert for keeping him in the Z-Team despite it being hard to voice out. Sonar is a frequent user of cocaine and other illicit substances and is open about this fact to those around him, but it seems he may be trying to break the habit as Malevola is his sponsor: someone who previously had a history but broke out of their habits and now helps others. Sonar is a big fan of Willem Vanderstenk, the CEO of VAND-CO, who is considered a certified financial genius, Sonar fails to understand jokes, when Robert Robertson introduces himself just for his team to laugh at his name, which Sonar starts repeating "Robert Robertson" to attempt to comprehend what's funny about Robert's full name. As a result of his Chiropteran physiology, Sonar enjoys eating insects and small mammals such as rats, though he is also capable of eating human food like Twinkies and tacos. He occasionally needs to scream to identify his surroundings via echolocation.