Hiryu Tsurugi/Change Dragon- The first dragon themed red ranger. He's a pretty emotional individual despite being a responsible leader.
Burai/Dragon Ranger- First sixth ranger of the Super Sentai franchise, first dragon themed ranger to pilot an actual dragon mecha. He is also Geki's brother, a villain at the start and died a hero in the end. He could be the template to Mikoto but I could be wrong.
Ryou/Ryuuranger- The second red ranger to have a dragon theme. He uses fire and lightning attacks. He has a fiery passion in battle.
Ryunosuke Ikenami/Shinken Blue- He like a dragon can be pretty emotional and unstable as water. He's also the first blue ranger to have a dragon theme.
Alata/Gosei Red- Perhaps the only dragon ranger who's not as fierce as he has a bubbly personality. He has the ability to see the true essence of things even out of suit.