|Full Name||Daisy Millar|
|Relationship||Blane Whittaker (crush)|
|Occupation||M.I.9 Spy, Student|
|First Episode||The Sinister Prime Minister|
|Last Episode||Asteroid Attack|
|Portrayed By||Bel Powley|
She is usually the kind of girl every boy in school dreams of due to her popularity and fashion. With an outgoing and bubbly personality, she can be mischievous and very malicious at times, but deep inside she can be very sweet, and cares about her friends. She is constantly worried about her appearance and wants to keep ahead with the latest trends and fashions. She hangs out mostly with her 2 best friends, Zara and Kaleigh (Series 1) / Leticia (Series 2). The 3 of them are the most popular girls in school.
Daisy is an only child and her parents both work abroad. In "The Power Thief", we learn that her father is the chairman of a museum trustee board and is famous because of the position; because of this, she has met the Queen and lives in a big country estate, although she tells no-one at school about her family or where she lives. Only Blane Whittaker finds out the truth in "The Power Thief". She has an interest in Blane but hasn't told him, she got jealous of Irena when Blane showed an interest in her in "Spy Plane". See: Blane and Daisy for Blane and Daisy's relationship.
Daisy is a master of disguise, and in many episodes she goes undercover. She has a lot of imagination when it comes to invent excuses when she's being called by Lenny for missions, or for distracting someone else's attention from someone/thing. She was one of the first M.I. High agents.
Socialite Daisy is a undercover expert with extraordinary chameleon abilities and a master in the art of disguise, building allegiance to get closer to the enemy. She makes diversions for the team and adapts herself in every situation.
In "The Big Freeze", she considered herself as useless in the team.
After the end of series 2, both Daisy and Blane leave the series to be in project Alpha, training new spies.
- In the episode, "Eyes On Their Stars", it is discovered that she loves boy-band "Crush".
- She is never seen twice in the same hairstyle.
- In the episode, "Super Blane", it is shown she likes cheer-leading.
- In the episode, "The Others", she is revealed to be an average student, often obtaining B or C as grades.