Cestro, Blue Aquitar Ranger
Ranger Designations: Blue Aquitar Ranger
Weapons: Sword, Blaster
Gear: Blue Battle Borg coin
Zords: Blue Battle Borg, Blue Shogun Zord

Cestro is the Blue Aquitar Ranger of the team labelled on Earth the "Alien Rangers". Cestro is the brains of the team. A master of technology, he creates weapons and devices which get the Alien Rangers out of tough situations. Aquitarians are an aquatic species, and need the pure water of Aquitar to survive. They cannot stay long on Earth without sufficient and proper rehydration.

Unmorphed, Cestro is capable of energy projection. He can shoot a blue liquid-like substance which creates strong gusts of wind and energy fields. Morphed, Cestro has heightened strength, durability, agility, and the ability to summon waterfalls out of nowhere to drown his opponents. He commands the Blue Battle Borg, and his weapons include a laser pistol and a sword. Cestro is also capable of long distance and line of sight teleportation.