This is a list of characters from the 2007-2008 Super Sentai Series Juken Sentai Gekiranger. Each faction is a different school of the fictional martial arts known as Jūken (獣拳, "Beast Fist").
Geki Jūken Beast Arts (激獣拳ビーストアーツ Geki Jūken Bīsuto Ātsu, "Fierce Beast-Fist Beast Arts") is a fictional school of martial arts practiced by the protagonists of the Japanese Super Sentai show Juken Sentai Gekiranger. Those that practice Geki Jūken use a form of Qi within their bodies that manifests their passion for justice, called Geki (激気(げき), "Fierce Qi"), as their power source. The ultimate form of Geki is the Kageki (過激気(かげき), "Extreme Qi"), which can manifest if the user mastered different aspects of the triangle and selflessly has the intent to protect others at mind. The sporting goods company SCRTC (スクラッチ Sukuratchi, pronounced like the English word ) serves as a front for the martial arts school, specifically its Gekirangers.
When transformed into the Gekirangers, the group says "Our blazing Geki is the proof of justice! Juken Sentai Gekiranger!" (燃え立つ激気は正義の証!獣拳戦隊ゲキレンジャー! Moetatsu Gekiwa seigi no akashi! Jūken Sentai Gekirenjā!). When having transformed into the Super Gekirangers, the group says "Our boiling Kageki flows toward justice! Juken Sentai Gekiranger!" (たぎる過激気は正義の為に!獣拳戦隊ゲキレンジャー! Tagiru Kageki wa seigi no tame ni! Jūken Sentai Gekirenjā!).
Jyan Kandou/Geki Red (漢堂 ジャン/ゲキレッド Kandō Jan/Geki Reddo) practices the Geki Jū Tiger-Ken (激獣タイガー拳 Geki Jū Taigāken) style, though still a beginner, his main focus is on power and Hu Quan moves. He is a Feral child who was raised by the tigers deep within the forest near the Beast Origin Village (獣源郷 Jūgenkyō). The son of Dan, Jyan was the sole surviving member of the nearby village that was destroyed by Long. Long had intended to kill Jyan in order to prevent Rio from fighting him, since Rio would undoubtably see Jyan as a potential rival since Dan is his father. But the pain of his mother's death before his eyes while holding on to dear life on the rapids blocked out his entire childhood memory prior to being raised in the wild. Because of his lineage, his senses have been sharply enhanced to feel qi like Xia Fu, who scouted Jyan as he personifies the "Body" (体 Tai, also pronounced as Karada) of a Gekiranger: Resistance to most forms of pain. This selection is strengthened when Jyan emits Geki while giving off a "Tiger's Roar" when the Akugata began to attack. Although at first he doesn't understand certain concepts or training, he eventually picks up and learns about it at a fairly high pace. He does not know very many common words so he sometimes describes things with words such as "niki-niki", "zowa-zowa", "waki-waki", his own personal "Jyan-ish" language. As he was raised by animals, he does not know and has to learn about the "Heart". Jyan is eventually labeled as Rio's rival after witnessing the display of power used to stop his own attack. He becomes Sharkie Chan's first student of the Geki Jū Shark-Ken (激獣シャーク拳 Geki Jū Shākuken) sword-fighting style. Though Jan possesses the Kageki (過激気 Kageki), he is unable to fully use it in his first fight with Rio.