Anno Domini
In Mobile Suit Gundam 00, Celestial Being had produced unknown numbers of Haros as an assistant of daily maintenance works. Currently at least 6 unique Haros have appeared in the animation production. The Haros in the series took much more maintenance and combat role than any other series' counterpart, usually seeing them operating with various machines, including mobile weapons.
The Haro which appears most is the Orange Haro, kept by the Gundam Meister Lockon Stratos, which accompanies him in the Gundam Dynames's cockpit, usually performing radar-like duties by detecting and warning Lockon of any incoming enemy units or attacks. In the event of close combat, Lockon's Haro is able to pilot his Gundam for him while he uses his sniper rifle, and control the additional shields that Dynames receives in episode 6. The Haro is returned to the Ptolemaios in Episode 24 after the destruction of Gundam Dynames. The Haro is later used in Cherudim Gundam's cockpit in season 2.
In episode 9, the four Haros address the orange Haro as "big brother"; their colors are blue, purple, red-violet, and dark green respectively. In episode 17, the orange Haro in turn addresses Nena Trinity's purple Haro, which was found in a wreck 80 years ago as "big brother". It might be suggested it is the prototype of the other Haros from the Celestial Being; that Haro is named "HARO" in official data, which named in English but not Japanese.
In episode 2 of the second season, a red-pink Haro is assigned to accompany with Saji Crossroad, who is initially detained by Celestial Being on Ptolemaios 2, and later used in 0-Raiser's cockpit to assist Saji, who has no experience using mobile weapons. It is unknown that if it was the same red-violet Haro appeared in first season, due to lighting issue.
From Fereshte, Hanayo, a manmade AI that is of the same model as Lockon's Haro that is yellow in colour appears to resemble a cat, since it has a tail and cat-like ears which are always flapping. A character that bears resemblance to Gundam Meister 874 is shown to be released from the inside of Hanayo as shown in the Gundam 00F manga.
The Haros that appear in Gundam 00 are 25 cm long in diameter and are larger than Lacus Clyne's and Meer Campbell's Haros (about 10 cm long in diameter), but smaller than Amuro Ray's.
Read more about this topic: Haro (character)