Mascots are costumed NPCs who appear in The Sims: Vacation, The Sims 2: University, The Sims 3: University Life and The Sims 4: Discover University.
This section describes features that are only available in The Sims: Vacation.
Vacation mascots appear on Vacation Island lots and interact with children. Unlike the other Vacation NPCs, mascots arrive in the morning and leave at night. Each area of Vacation Island has its own mascot. The snowy mountain area has "Betty Yeti," the forest area has "Archie Archer", and the beach area has "Marky Sharky". The only difference between these three characters is the costume they wear.
Mascots will follow kids around and try to get their attention, often with little regard to whatever the kid may be doing at the time. Mascots will often want to hug kids, but a kid who is in a bad mood may respond by hitting or kicking the mascot.
The Sims 2: University
There are two types of costumed university mascots. One is the llama mascot, who is essentially a costumed male version of the cheerleader. The other is the evil mascot, who is dressed as a cow. The cow has few, if any, body points, while the llama mascot has the body skill maxed out. If both of these mascots appear on the lot, they will most likely get into a fight.
There are three of each, and it appears that each college lot, both residential and community, is assigned its own llama mascot and evil mascot. However, this is not obvious, as mascots are rarely seen out of costume. Mascots will change out of their costumes when swimming, or when doing things such as using exercise equipment or soaking in a hot tub.
Like other college NPC's, mascots are always freshmen.
If a mascot is added to a household, the game will generate a new one. Mascots will become playable when added into a household, and will be able to graduate, but their behavior will retain some NPC characteristics even after graduation. A mascot who graduates and is moved into the neighborhood may still visit campus, and may still walk into other Sims' homes without being invited.
This section describes features that are only available in The Sims 2: University.
Unlike the llama mascots, who are always male, an evil mascot (identifiable by the cow costume) can be either male or female. He or she will come into a dorm, house, or Greek house and pull pranks, fight with, flirt with or otherwise generally annoy the Sims who are there (this is because all evil mascots have the same personality; they are completely Outgoing and Playful but have no other personality points, which gives them a strong tendency toward aggressive social interactions such as poking, shoving and even belching at any Sim they see). This personality is very strongly fixed, so even if evil mascot dies and resurrected with Resurrect-O-Nomitron for a price that should reverse his or her personality, it immediately is reversed back to the default one. This is true for evil mascots who are added to families, and even for those edited with Sim Modder, the personality is reversed to default when entering community lots or exiting to the game.
One of the two ways an evil mascot can wreak the most havoc is by setting off a sprinkler, which makes a large mess that will have to be cleaned up. The other way is by flirting with a Sim while the Sim they are in love with/engaged to is watching. This will cause the other Sim to become furious at their significant other and effectively destroy the relationship. However, anything an evil mascot is preparing to do to a selectable Sim can usually be canceled from that Sim's action queue.
These mischief interactions are actually pushed onto the evil mascot by the game, and the mascot thinks the player is giving the commands. This is why the evil mascot will sometimes whine or throw a tantrum before doing actions such as 'sweet talk' and cheer before doing mean or playful actions such as poking, shoving, wolf-whistling, or pranking.
An evil mascot made playable will retain the fixed personality, but will be better behaved.
Evil mascots may call Sims all the time to bother them, even after they graduate, but this is not peculiar to them. According to the Prima Guide for University, the evil mascots are from a rival school, although this is debatable since they can be called by using the Campus Directory that is available on phones in college sub-neighborhoods.
An evil mascot will leave a residential lot if told to leave by a playable Sim. However, the "Ask to Leave" interaction will generally not interrupt any mischief that the evil mascot is preparing to do; the playable Sim may spend some time chasing the evil mascot around the lot before finally being able to tell the evil mascot to leave.
An evil mascot may have some points in the Body skill, but both the llama mascots and the cheerleaders have the Body skill maximized. So, when evil mascots get into fights with llama mascots or cheerleaders, they often lose.
An evil mascot who appears on a community lot may use the lot's facilities in the same way as any other college Sim, but is more likely to try to cause mischief.
An evil mascot who is added into a household can perform the school cheer and have special clothing like the llama mascots.
These mascots have their names randomized when the sub-neighborhoods are created. Their names are only referenced in the game files.
The Sims 3: University Life
Like its counterpart in The Sims 2, University Life also features a mascot wearing a llama costume. However, the mascot in University Life can be either male or female, and there are no evil mascots.
The mascot's function is largely related to school spirit. A Sim who has a high enough relationship with the mascot may ask the mascot to teach him/her a dance.
In addition, the mascot will bring the university welcome kit to the active family's household, if the welcome kit is not already available there.
The Sims 4: Discover University
Mascots reappear in The Sims 4: Discover University. Both college campuses feature their own unique mascot. The University of Britechester features a green dragon costumed mascot known as "Darby the Dragon", while the Foxbury Institute features a red lobster costumed mascot known as "Lobster Larry". Like in University Life, both mascots can be either male or female.
At events where both universities are present, such as pep rallies, the two mascots may often get into a fight where the winner steals the loser's mask. Otherwise, the mascots can often be found wandering around their respective campuses or visiting their commons lots. Sims can take selfies with and high five a mascot, or prank them with stink spray.