Nanami Koyabashu

Nanami Kōzui Koyabashu is the second and current Blue Beast Ranger of the Beast Rangers.

Origins
Nanami is the daughter of Martial Arts Master Satoshi Koyabashu and current wife Umeko Sadao-Koyabashu she's the younger half-sister of Jasmine the Army Patrol Yellow Ranger and Keiko the Squadron Yellow Ranger. Nanami is also the half-cousin Kelly the Five Star Pink Ranger, Kenny the SpyForce Blue Ranger and Remi the Supersonic Yellow Ranger.

Before Ranger Status
Nanami is the youngest of 3 girls of her family her father Master Koyabashu taught her the martial techniques of a dolphin and she has dreams to take over her father's Temple when he retires and due to her elder siblings already taking on Ranger duties.

Dolphin's Newest Guardian
When the Dolphin Spirit fell into the wrong hands the remaining Rangers went after the Sorceress and her latest monster she summoned Hydrola and she almost succeeded taking down the Rangers but Nanami intercepts the assault and lure the Rangers to a retreat. Nanami was surprised that the other Rangers knew about her siblings and cousins serving as Rangers retrospectively. She explained she retrieve the dolphin spirit from the Sorceress' lair and made it her mission to bring it back to the Rangers but little did the fivesome knew the battle is not over yet.

The New Blue Ranger
The Sorceress pursues the Rangers and the Dolphin Spirit and fought Nanami for control but as the Sorceress pushes Nanami down to the waterfall but as she fell into the water Nanami did not realize that she can breathe underwater then she sees the spirit of Amaya Hisakawa the original Blue Ranger who left the team to begin a new life passed her morpher and her powers to Nanami allowing her to take the mantle of the Blue Ranger.