Pest

None are stated or implied in the film. The story covers a single chaotic night; the ending leaves Pest (and Moses) in police custody but celebrated by the Block’s residents. There is no sequel material that expands his personal arc or long-term plans.
In short, Pest is the smallest, loudest, funniest, and most resilient member of the crew—a pure product of the Block who talks in rapid slang, throws fireworks and bat swings with equal enthusiasm, flirts shamelessly, stays loyal under fire, and provides most of the film’s comic energy while still being genuinely tough. The images you shared match his look perfectly across different points in the night (bike/hoodie phase, fireworks-backpack close-up, later green-shirt + bat phase, and expressive close-ups).

Pest starts the film as one of the muggers who target Sam. After the first small alien appears and is killed, larger predatory aliens (the “big alien gorilla-wolf motherfuckers”) begin falling. Pest is the fireworks specialist (rockets in his backpack) and uses an aluminum baseball bat as a backup weapon. He is badly bitten in the leg during an attack, limps for much of the rest of the film, and still keeps fighting, talking, and supporting the group. Key moments include begging Sam (once they learn she’s a nurse) to treat his leg, staying loyal when others fall, helping hold the line in the weed room / flat sequences, and surviving to the end. After the aliens are defeated, he is arrested along with Moses (and others), but the residents cheer them as heroes and Sam defends them to the police.

• Background: Lives on the same South London council estate (the Block) as the rest of the gang. Part of Moses’s crew of “wayward youths” / teenage hoodlums who mug people, deal with local threats (including the dealer Hi-Hatz), and treat the Block as their territory. He is shown retrieving a baseball bat and fireworks from home, pausing to kiss his grandmother on the head as he leaves—indicating a more grounded domestic life than Moses (who essentially lives alone with an often-absent uncle). 
• Family: Has a grandmother (“Pest’s Nan,” played by Yvonne D’Alpra) who appears briefly; he lives with or is close enough to her to grab gear from the flat and show affection. No parents, siblings, or other family details are given. 
• Relationships: Loyal to Moses and the rest of the crew (Dennis, Jerome, Biggz). He flirts persistently (and mostly unsuccessfully) with Sam throughout the night. By the end he is part of the core surviving group that includes Sam, and he returns her stolen ring at Moses’s insistence. He has a comedic/soft side (wears a “Granny Magnet” T-shirt in one sequence after they pool clean clothes). No romantic relationships or deeper personal history are explored beyond the gang dynamic and the single night’s events. 

Pest is the plucky comic relief, deadpan snarker, and most talkative / sarcastic member of the group. He contrasts Moses’s quieter stoicism: energetic, mouthy, impulsive, loyal, resilient, and a bit of a joker who keeps the banter going even under extreme stress. He’s street-smart in a loud, theatrical way, flirty (especially with older women like Sam), and has a “crazy / loco / cuckoo” chaotic energy according to the actor’s own description of the role. He is also surprisingly tough (“Made of Iron”)—he keeps fighting and running despite a serious alien bite to the leg that leaves him limping. 
How he talks / manner of speaking (heavy South London / Multicultural London English street slang, rapid-fire, exaggerated, and full of colorful inventions):
• Frequent “bruv,” “cuz,” “trust,” “believe,” “innit,” “blood,” “bare” (meaning lots of), “nah nah nah.”
• Iconic lines include coining the aliens’ description: “Big alien gorilla-wolf motherfuckers. I swear.”
• Flirty and cheeky with Sam: “You’re quite fit you know? Have you got a boyfriend?” … “You sure about him? Where is he? Cos he ain’t exactly lookin’ out for you tonight.”
• Sarcastic/defensive: when Sam suggests calling the police — “You’d be better off calling the Ghostbusters love.” Or explaining the creatures: “Dogs? What kind of dogs those? Dogs with no eyes? Dogs the size of gorillas? … Go out there and try feeding them some Pedigree Chum! They’re ALIENS, luv!”
• Rapid storytelling dumps full of slang when explaining the night’s events.
• He loves to talk, cracks jokes under pressure (“Call Simon Cowell. Aliens Got Talent”), and stays loyal and hyped even when injured.
Overall vibe: the loud, funny, slightly reckless little brother / second-in-command who talks too much, flirts, invents the best descriptions, and still shows up with a bat or fireworks when it counts.

Exact height, weight, clothing size, age, and date of birth are not stated in the film or official materials for the character himself. What we have comes from on-screen portrayal, actor details, and descriptions:
• Height / build / size: Consistently described and shown as the smallest / “pint-sized” member of the gang (“Pint-Sized Powerhouse”). He is compact, wiry, and youthful-looking. Actor Alex Esmail is listed around 5’7” (170 cm); on screen Pest reads as a short-to-average teen relative to the others. No official clothing size is given; his look is baggy streetwear (hoodies, jacket with orange accents, dark trousers, sneakers). 
• Age: Teenager, roughly mid-teens (around 15–17). Actor Alex Esmail was about 16–17 during filming (born 18 July 1993) and has described the character as “the young one of the group… only 16.” Moses is explicitly revealed as 15; Pest is in the same peer group and presented as a peer rather than significantly older or younger. 
• Date of birth: Not given for the character. (Actor’s is 18 July 1993.)
• Appearance: White (the only white core gang member), dark/messy hair often under a hood or beanie with braided/drawstring details, expressive wide eyes, and a slightly cheeky/energetic face. Frequently in layered hoodies/jackets (one with orange paneling), backpack (sometimes with fireworks/rockets sticking out as a Boba Fett homage), and later a green T-shirt under a dark jacket while wielding a bat. He rides a bike and ends up with a severe leg injury from an alien bite.