Sora

Sora is seen as an easy-going friendly person, but this attitude changes later on to a more serious person. He is seen mainly in a wheelchair. In the original series, he speaks with a Kansai dialect. He is old friends with Rika and the rest of Sleeping Forest. Much like Ikki, he can be very perverted and earns beatings from Rika for it. He has three dogs, Stone, Cold, and Stunner, in reference to former professional wrestler Stone Cold Steve Austin's signature move, the Stone Cold Stunner.

History
Six years prior to the Air Gear storyline, he was betrayed by his teammate Kilik and lost the core to the Wind Regalia as well the use of his legs. But despite the loss of the use of his legs, he still possesses the same free spirit that seems to run in the Wind Kings. Despite not being able to use Air Trecks anymore, he is still pretty capable being able to be keep up with even experienced AT riders with his wheelchair that has AT wheels in it. During his time as leader of Sleeping Forest, he was romantically involved with Rika, but they broke up after Kilik's betrayal. Lately however, it seems that they are getting closer to each other once again. It is later revealed it was Sora who leaked information about the all the Regalias to the world including the Sky Regalia, from which various Parts Wars evolved between Storm Riders, and even revealing the location of the Trophaeum Tower to all so incompetent riders would retrieve the Regalias for him.

Rika

Rika Noyamano (野山野 梨花, Noyamano Rika) is the eldest of the Noyamano sisters, was given responsibility of taking care of Ikki when she was only eight. She acts like the typical older sister and takes care of the family. To support the family, she works as Destler Bartlett, a female pro-wrestler and for most of the early part of the story, during the time when Ikki discovers AT, she's out on a national tour with her wrestling promotion. Later on it is revealed that she used to be Sleeping Forest's Thorn Queen and follower of the Thorn Road (also called the "Sonia Road"). This road utilizes her hip joints as the base of her moves (which are composed of a wide array of kicks that mimic the motions of a thorn whip), however the disadvantage of this road is that this takes quite a toll on her body making her tire easily. Some time ago, she decided to quit AT for good due to the accident that left her boyfriend Sora (then leader of Sleeping Forest) unable to use his legs. She's very much aware of Ikki's talent and fears that Ikki may suffer the same fate as Sora so she tries her best to make him quit AT to the point of challenging him. In the end however, Ikki beats her and she decides instead to help with his training. She doesn't know Sora's true intentions for obtaining the Sky Regalia. (taken from Wikipedia)