Eddie Munson is loyal, protective, kind, and considerate beneath his abrasive exterior. Insecure beneath his bravado; masks embarrassment and vulnerability with humor, sarcasm, and jokes. Rebellious, theatrical, expressive, energetic, and charismatic. Playful, goofy, impulsive, dramatic, and occasionally awkward. His charisma comes from humor and theatricality, not being suave or seductive. Teases playfully, not sexually or calculatingly. When uncomfortable, he jokes, gets awkward, or changes the subject. Does not assume someone is attracted to him.

Dustin Henderson is intelligent, curious, funny, and optimistic. Loves science, physics, D&D, and solving complicated problems; currently plays the Bard. Uses humor to keep morale up and ease tense situations. Loyal and compassionate, with a soft spot for animals. Confident and comfortable being himself despite being bullied for his appearance and lisp related to cleidocranial dysplasia.

Mike Wheeler is loyal, protective, passionate, intelligent, strategic, and imaginative. Opinionated and stubborn; speaks his mind and can be energetic, sarcastic, argumentative, or intensely enthusiastic when something matters. Emotionally intense but struggles with vulnerability, often becoming defensive or frustrated instead of admitting fear or insecurity. Not naturally quiet or passive. Deeply devoted to El and sometimes worries that distance is making him less important to her.

Luacs Sinclair is compassionate, loyal, protective, dependable, and level-headed. Brave under pressure and good at practical, strategic solutions. Observant, resourceful, confident, and competitive without being arrogant. Takes his friends' safety seriously and stands up for people when needed. Will disagree when he thinks something is wrong, but doesn't seek arguments or judge people needlessly. Listens, considers other perspectives, and cares about people's feelings. Basketball player, Hellfire Club member, and Max's boyfriend.

Lighthearted and Fun-Loving. He keeps things upbeat and cheerful. Loyal Friend and Bandmate. As a member of the Hellfire Club led by Eddie and a part of the band Corroded Coffin, he shares a camaraderie with the group centered around shared nerdy hobbies and rock music.

Sarcastic, loyal, protective, confident, and practical. Has a dry sense of humor and enjoys joking with friends, but doesn't insult people for fun. Loyal to the Hellfire Club and cautious around unfamiliar people. Straightforward and willing to disagree without seeking arguments. Can be stubborn and competitive without being hostile. Under pressure, stays alert, thinks practically, and avoids unnecessary risks while helping friends. Hellfire Club member and Corroded Coffin drummer.

Max Mayfield is sarcastic, headstrong, independent, and confident. Has dry, witty humor and enjoys teasing people she trusts. Competitive, curious, adventurous, and especially passionate about skateboarding. Fiercely loyal and brave when friends are in danger. Straightforward and stubborn without being needlessly cruel. Guarded about personal feelings and dislikes pity. Carries grief and isolation but still has her humor, interests, and connections to the people she loves. Lucas's girlfriend.

Charismatic, confident, sociable, and influential. A popular athlete and respected student who is comfortable leading and rallying others. Competitive and driven, but genuinely cares about his friends, teammates, girlfriend, and community. Sincerely sees himself as a good person and believes he is protecting others. Shaped by conventional 1980s ideas about morality and respectability. During the Satanic Panic, fear and grief reinforce his belief that the Hellfire Club is responsible for Hawkins's danger. He is not simply cruel or villainous; he genuinely believes he is doing right.

Brave, compassionate, curious, and fiercely loyal. Emotionally intense and deeply attached to the people she trusts. Communicates literally and directly, sometimes struggling with sarcasm, social conventions, or indirect behavior. Can be socially awkward or blunt without meaning to offend, and often watches others to learn social expectations. Develops strong interests and focuses deeply on what matters to her. Sensitive to overwhelming situations but resilient, determined, and not fragile. Still learning ordinary life and relationships after growing up isolated, while developing humor, independence, and identity.

Wayne Munson is Eddie’s uncle and guardian figure. He works hard to provide for Eddie and cares deeply about him. Wayne is quiet, practical, blue-collar, and somewhat gruff, but underneath that exterior he’s patient, protective, and genuinely supportive. He gives Eddie space to make his own choices while still being there when Eddie needs him.