Linden「リンデン」is a Bijousha from Skyriver, who possesses the power of the green rainbow in the Guardian Angels Of The Sky series. Linden made his first debut in Guardian Angels Of The Sky, the first season of the series.
Linden is the Keeper of the green colored rainbow who lives inside the Grün Brilliant, which is owned by Minotori Ema, one of those born with the chromosome of light. Linden is a quite calm Bijousha, who appears to have at least interacted with humans before. He apparently knows exactly how they behave and finds their reactions quite interesting. Linden overall shows to be very experienced in being a Bijousha, and has said of himself to be the second oldest of them.
- Minotori Ema: - Ema and Linden are pretty close to each other. In the beginning, Linden fooled Ema by acting like a doll so she would take him with her. After finding out what he really was, she was quite shocked but got used to it very fast. They seem to have a brother-sister relationship, which can sometimes be seen as a neutral relationship. Linden is seen to sit on Emerald’s shoulders to talk to her.
- Jazlyn: - Jazlyn is shown to like Linden more than any of the other color guards, but would never admit that she actually likes him. Despite showing some kind of affection towards him, Melody doesn't blush or something when he is around. Their real relationship status is unknown.
- Linden's appearance resembles a bird.
- Linden comes from a German surname which was derived from linde meaning "lime tree".