Now while Gaoranger is technically the first sentai I sat down and finished, Abaranger was my first actual exposure to sentai because of. Well. Dino Thunder.
I can't reasonably be unbiased to Abaranger because that's MY show. It's got dinosaurs, Masaaki Endoh, and friggin' (gestures wildly) ABAREKILLER. I think this show sparked my love for pointy guy armor.
The wind howls, the sky rages. Air Ninja, HurricaneRed! Power of Air! Crimson lightning. Horned Ninja, KabutoRaiger! Power of Thunder! Explosive Energy! AbaRed! Tyranno Power, Red Ranger! One! Hating cruel wickedness! S.P.D.! DekaRed! One! S.P.D. Red Ranger! The Burning Flame Element! The Red Mage, (Legend) MagiRed! Fearsome/Forceful as fire, Red Mystic Ranger! Born in darkness, clad in darkness... Dark Magic Knight Wolzard! Burning heart of fire ,Wolf Warrior Defender of truth! The Fiery Adventurer! Bouken Red! Kick into Overdrive! Red Ranger! Infinite power flows in my body! Unbreakable Body. GekiRed! With the strength of a tiger, Jungle Fury Red Ranger! Mach Full Force!! Go-On Red! Here's all of the Sentais that were adapted into the Disney era. Next up is all of the red rangers from the Neo-Saban era and the sentai they were adapted from.