|Season||Guardian Angels Of The Sky|
|Element||Water & snow|
|First Appearance||Episode 05
Blue is one of the main mascots of the Guardian Angels Of The Sky series. Blue is a color guard from Skyriver and was the fifth of them to arrive at earth in Guardian Angels Of The Sky. Blue is the guard of the blue rainbow and currently lives with Sapphire. Blue ends all his sentences with "ao".
Blue has, like every color guard of Skyriver, the ability to give the chosen girl the power to transform into the legendary warriors of the rainbow, the Guardian Angels. Blue is the guard of the blue rainbow and has the ability of liquids. Blue is able to use less powerful attacks a than his partner and can let it snow over an enemy. As shown in episode 18, Blue has to shout his suffix "Ao" and rise his little arms to activate the power. Whenever the angels got a power up, Blue and the others had also got a one.
Blue is a young little color guard, who is a little crybaby and can get scared easily. Blue has a kind heart but is not brave enough to speak this mind out loud. As long as they lived on Skyriver, Blue always hid behind his older sister White, who’s a lot braver and more outgoing than him. However, thanks to his kind heart, Blue can make friends easily and understands others well. When he used to be a coward when he was little, he got a lot stronger through his adventures with the Angels.
- White - Blue's older sister, who is the guard of the silver rainbow. Blue is a big crybaby and White's duty is it to prepare him for his work as color guard and comfort him whenever he feels down. After the two arrived on earth, the siblings live more separated from each other than before. However, they still seem to have a good relationship.
- Aomizu Sapphire - Sapphire is the angelic warrior of the blue rainbow and Blue's partner. Sapphire cares for Blue a lot and usually shows that when protecting him from others. Even before they officially met, Sapphire did all she could to save Blue from Voide. She thinks Blue is really cute and would do all to cheer him up, when he's sad.
- Nobumoto Quartz - Blue was the first to not attack Loo in any way. Though he was rather scared to see Loo, he listened to what he was saying in a neutral, caring way. Though Loo was his enemy back then, he told Blue that he can't give up and needs to go on with fighting his friends. Later on, the two have shown to have developed a very good friendship, even though Sapphire isn't very happy about that.
Blue (ブルー?) - Blue is the color between violet and green on the optical spectrum of visible light. In traditional color theory, blue is one of the three primary colours of pigments, along with red and yellow. Blue is the colour most commonly associated with harmony, faithfulness, confidence, distance, infinity, the imagination, cold, and sometimes with sadness.
- Alice✳Blue (along with Amamiya Sora)