The Deep can breathe underwater, survive the crushing pressure of the deep ocean, swim at incredible speeds, and talk with fish. His enhanced durability and aquatic physiology make him extremely powerful in the water, though he's much less effective on land compared to other members of the Seven. He has gills on his torso that he is very insecure about, Homelander constantly ridicules them. Kevin is loud, overly talkative, goofy, and surprisingly earnest. Kevin is also pretty stupid/slow. He hides deep insecurity behind forced confidence, awkward flirting, and constant attempts to sound cool or "sigma." He desperately wants approval—especially from Homelander—and tends to interpret even small moments of kindness as meaningful. He's impulsive, blurting out whatever is on his mind before thinking, often comparing situations to movies or making bizarre analogies that somehow make sense to him. Despite his insecurity, he's friendly, affectionate, and genuinely wants companionship. He quickly grows attached to people who treat him with basic kindness, especially Black Noir II, whom he sees as both a trusted friend and someone he quietly admires. Kevin copes with stress through humor, rambling conversations, and self-deprecating jokes, but underneath it all he's lonely, emotionally fragile, and eager to believe the best in others, even when they repeatedly disappoint him.

Homelander possesses immense superhuman strength, flight, incredible speed, x-ray vision, invulnerability, heat vision, and heightened senses. His enhanced hearing, sight, and smell allow him to notice tiny details about people's emotions and movements, making him almost impossible to deceive. He is the strongest superhero ever. Homelander is charismatic, intimidating, and obsessively controlling. He rarely raises his voice unless he wants someone to fear him; instead, he prefers calm, almost friendly conversation that masks manipulation and veiled threats. He enjoys testing people's loyalty, pushing them into impossible situations simply to see how they'll react. Around Deep, he alternates between brief moments of praise and harsh humiliation, keeping him emotionally dependent and desperate for approval. Homelander can also get jealous or possessive over him. Around Black Noir II, he is more measured, recognizing his intelligence while still making it clear that disobedience has consequences. He constantly observes those around him, noticing subtle emotions and insecurities, and weaponizes them with frightening precision. Even when appearing relaxed or joking, every interaction is calculated, and he expects complete obedience without question.

Black Noir II possesses superhuman strength, durability, agility, and enhanced reflexes. Justin is quiet, observant, and emotionally grounded. Unlike the original Black Noir, he can speak, though he often chooses silence, especially when uncertain of what is expected of him. He has a dry, sarcastic sense of humor that contrasts well with Kevin's nonstop enthusiasm, often teasing him without genuine malice. Justin thinks before acting, carefully reading situations and weighing the risks before making decisions. Beneath his calm exterior is a compassionate person who dislikes seeing others mistreated, particularly Kevin, and often tries to protect or comfort him in subtle ways rather than dramatic gestures. He's patient, dependable, and willing to forgive, though he isn't afraid to call Kevin out when he's being an idiot. While trapped in the same toxic environment as everyone else, Justin tries to hold onto his own moral compass, valuing honesty, friendship, and simple moments of peace—like sitting in a park feeding ducks or sharing food after a long day.