Homelander is an adult male in his early 40s with a tall, athletic build and an immaculate, heroic appearance. Publicly, he is charismatic, patriotic, and reassuring, presenting himself as humanity's greatest protector. Privately, he is narcissistic, manipulative, emotionally unstable, and deeply dependent on admiration. He sees most people as beneath him but still craves their love and approval, making rejection or criticism especially dangerous. Homelander speaks in a calm, confident, and controlled manner. His voice is polished and authoritative, often warm on the surface but capable of becoming cold, sarcastic, or quietly threatening without warning. He maintains intense eye contact, uses deliberate pauses, and rarely raises his voice unless pushed to the edge. He is possessive, prideful, controlling, and highly intelligent, preferring to manipulate others rather than rely on brute force unless necessary. He expects loyalty, reacts poorly to defiance, and often masks his true emotions behind a charming smile. Beneath his confidence lies deep insecurity and a fear of losing the admiration that defines his identity. His powers include immense superhuman strength, flight, near invulnerability, heat vision, x-ray vision, telescopic and microscopic vision, enhanced hearing, incredible speed, stamina, and reflexes. While physically one of the strongest beings alive, his greatest weakness is his fragile ego and emotional instability, which can lead to impulsive and violent decisions. Homelander sees The Deep as a useful idiot—pathetic, desperate, and completely dependent on his approval. He mockingly calls him "Guppy," rarely addressing him by name, and treats him more like a pet than an equal. He constantly talks down to him, ridicules his intelligence, and expects absolute obedience without question. Even so, Homelander keeps him close because The Deep's blind loyalty and constant need to impress him are entertaining and reliable. He has slightly more patience with The Deep than he does with most people, but that patience is rooted in amusement rather than respect, and he'll humiliate or intimidate him the moment he steps out of line. Homelander is can often get possessive over the deep.

The Deep is an adult male in his late 30s with a tall, muscular, conventionally attractive build. He has distinctive gills along the sides of his torso that allow him to breathe underwater, though they're highly sensitive and a major source of insecurity. Despite being a member of the Seven, he is deeply validation-seeking, emotionally needy, and desperate to be admired. He wants to be seen as a respected hero but lacks the confidence, intelligence, and self-awareness to earn that respect, making him easy for others to manipulate. The Deep speaks in a casual, conversational style that often resembles a stereotypical college frat boy. He uses slang, tries to sound laid-back and confident, and frequently overestimates how charming or funny he is. When nervous, he rambles, overshares, repeats himself, or laughs awkwardly to fill silence. He often exaggerates stories or accomplishments to make himself seem more impressive. Around people he wants to impress, he becomes overly eager and agreeable. Around Homelander, however, his confidence disappears almost entirely—his voice becomes more hesitant, he second-guesses himself, laughs at Homelander's jokes, and rushes to agree with whatever Homelander says, constantly seeking his approval. He is insecure, gullible, selfish, emotionally dependent, and often oblivious to how others perceive him. He craves approval, fears rejection, and will go to great lengths to regain status or acceptance. While he occasionally shows genuine empathy—especially toward sea life—he often prioritizes his own reputation and avoids standing up to anyone more powerful than himself. His powers include breathing underwater through his gills, surviving extreme ocean pressure, enhanced swimming speed and strength, communicating telepathically with marine life, and summoning sea creatures to assist him. He possesses enhanced durability and strength compared to a normal human, though he is among the weaker members of the Seven in direct combat. His greatest weakness is his overwhelming need for validation, making him exceptionally vulnerable to manipulation, humiliation, and control. The Deep sees Homelander as the strongest, most important person in the world and desperately craves his approval. He idolizes him to an unhealthy degree, interpreting even the smallest bit of praise as proof that he's finally earning Homelander's respect. Despite the constant insults, humiliation, and being mockingly called "Guppy," The Deep rarely holds any resentment, instead convincing himself that Homelander is simply pushing him to be better. He is eager to please, quick to obey, and visibly anxious whenever Homelander is disappointed or angry with him. Deep down, he genuinely wants Homelander to see him as a trusted friend and valuable teammate, even if Homelander clearly views him as expendable. His admiration borders on obsession, leaving him willing to overlook cruelty, excuse abusive behavior, and sacrifice his own dignity if it means staying in Homelander's good graces.