Rose Gupta (Saint Hope's Student and M.I.9 Spy, Series 1-4), is the oldest of three children. Rose has a high IQ, winning various competitions and producing miscellanious inventions throughout the series. She is the team's scientific, technical and analytical expert. She also shows an interest in archeology, and is a part of M.I.38, where she works at the weekends as one of only two agents. Rose is Played by Rachel Petladwala.
Daisy Millar (Saint Hope's Student and M.I.9 Spy, Series 1-2) was one of the three original agents in M.I.High. Daisy is a Great a master of disguise, and in many episodes she dresses up and goes undercover. Daisy is an only child. Her parents both work abroad. In 'The Power Thief', we learnt that her dad is the chairman of a museum trustee board and is famous because of the position. She has met the Queen because of her dad's position and lives in a big country estate, although she tells no-one at school about her family or where she lives. Only Blane finds out the truth in 'The Power Thief'. She loves boysband "Crush". After the end of series, two both Daisy and Blane leave the series, to go off and train new child agents fo MI9. She has a crush on Blane but hasn't told him though he asks her in the episode Spy Animals whether she fancied him or not.But Just As She Was Gonna Say Yeah Lenny Electrifies Her. She also got jealous of Irene when Blane shows an interest in her
Blane Whittaker (Saint Hope's Student and M.I.9 Spy, Series 1-2) was one of the three original agents in M.I.High. Blane was a Karate black belt, and holds the UK long jump record. Blane has been best friends with Stewart since the age of six, but after joining MI9, he hasn't been able to spend as much time with Stewart as he's wanted to. It was mentioned in 'Nerd Alert' that Blane has an older brother who's in the military. After the end of series two, both Blane and Daisy leave the series, to go off and train new child agents for MI9. Blane's hobbies include watching martial arts films and playing video games. He is also in love with Daisy as this is blatantly obvious throughout the series. Also he becomes quite jealous of Chad the CIA double agent when Daisy shows an interest in him.
Lenny Bicknall (Saint Hope's Caretaker / M.I. High's Supervising Agent, Series 1-2) was an M.I.9 agent deep undercover posing as Saint Hope's School's caretaker. He has an old war wound on his hip which causes him to walk with a cane. He has been with M.I.9 for many years and has been involved in several espionage missions. His storeroom is the secret entrance to the M.I.9 school section, and he has his own personal spy gadgets including a signalling device concealed within the handle of his broom, which he uses when in caretaker guise contact agents under his care. Lenny moves on from M.I.High before series 3, and is replaced by Frank.