Bive's entire body is made of black hair. She wears vibrant white glasses that seem to emote as eyes do in official art, and she has exposed, white teeth with two sharp maxillial canines. She also wears a beige trench coat. Bive tends to stand in a shaky, paranoid stance, while looking left to right. Bive is an extremely paranoid conspiracy theorist, with most of said dialogue consisting of her rambling about various things, occasionally to nobody in particular. Bive believes she is being hunted by a corrupt government staffed entirely by circus clowns for what she knows, and is scared of clowns because of this. As seen by her tendency to speak in all capital letters, it can be assumed that she also shouts a lot. Bive appears to be closest to Split than to most NPCs, having more dialogue with her than with other characters. Bive does not take showers or clean herself as she finds it a waste of time, leading other characters to remark on her poor hygiene

Infected is a Robloxian[3] that has short brown hair with striped hair extensions--green black on the left, pink-black on the right--and a purple hat (the Sk10r Boi accessory) featuring a bunnyfreaker sticker and three pins with the epic face, Nyan Cat, and Domo printed on them. He wears a pink t-shirt with the words TOUGH GUYS WEAR PINK with black pants with white shoes. Description Infected acts like a stereotypical skater boy, as well as being a walking reference to classic Roblox/internet humor, and speaking only in leetspeak. They are generally friendly and easygoing, if a bit clueless at times. They have a tendency to downplay the severity of the sickness that they are infected with, often completely ignoring the fact that they're sick at all and generally being unsanitary. Infected is convinced that their name is "Infected" and is often confused when other people (such as Lampert, one of his former friends) bring up his original name to him.

Lampert appears as a grey, supposedly metal R6 Robloxian character with grey joint lines and a light-yellow lampshade for a head. He has hexagons on his knees and elbows also acting as joints and hinges on the back of his knees. His eyes appear to have eyebags. He also has a light bulb switch hanging from the left side of his lampshade, and a black electrical plug tail. Lampert has a huge hatred for germs and likes to stay clean and organized, with most of his dialogue consisting of him complaining about germs and dust.

PartyNoob has the appearance of a stereotypical Roblox noob. They have a yellow head and arms, a blue torso, and green legs, however Poob's color palette comparing to regular Roblox noob is inaccurate due to their legs having a dark green color instead of yellowish green. They also have a custom ":3" face, a purple party hat with colorful stars on it, and a party horn that can be in a random color, but is depicted as red in most official renders. It has been officially declared that PartyNoob is bald and so is any character which doesn't have visible hair. PartyNoob is a happy-go-lucky individual with a love and borderline obsession for partying. Most of their dialogue relates to partying, birthdays, or something related to those topics. They present as somewhat childish and silly, and tend to be oblivious and naive to the world around them. Their constant happiness annoys the more serious or grumpy NPCs, especially Gnarpy and Pest. Despite their general silly and unassuming demeanor, they seem to be affiliated with MR in some way, albeit unwillingly; the meteors that originate from MR on the Happy Home Party floor don’t fall if PartyNoob is in the elevator, and PartyNoob cannot be killed by MR. It has also been hinted that PartyNoob's happy attitude is a coping mechanism due to things that they've seen.

Melanie is an anxious, friendly individual who seems to be very close with some of the NPCs. She is quite self-deprecating at times, such as stating "I'm not worth the trouble" when given certain items. She's nice to those who are nice to her and can get quite anxious when Folly is mentioned. She also has a hatred for Folly after what she did to Melanie, which causes Melanie to make rude remarks about Folly when brought up in conversation. She has nicknames for certain NPCs, such as Pilby (who she calls Pilbs.[3]). She is also quite athletic, as she is the only NPC besides Wallter who can complete the Intense Obby, and she enjoys jumping. Mozelle calls her "hopscotch" as a nickname.[4] She's helpful too, often offering to help others. In some instances, she asks if she could help Pilby get to their mother with the help of Mach. She also encourages Split when she mentions that she feels down while thinking about the future and Splitsville!. She also loves animals, as in one line of dialogue, she mentions wanting to protect the animals in PET CAPTURE DELUXE from "something."[5] Melanie is an anxious, friendly individual who seems to be very close with some of the NPCs. She is quite self-deprecating at times, such as stating "I'm not worth the trouble" when given certain items. She's nice to those who are nice to her and can get quite anxious when Folly is mentioned.