Princess Cobra

Princess Cobra ヒメコブラ (Himekobura) is a serpent created by Toho that first appeared in episode 1 of the 1973 tokusatsu  series, Warrior of Light Diamond Eye titled My Name is Diamond Eye.

A New Enemy: Princess Cobra
In the episode, King Cobra and Diamond Eye are fighting once again. King Cobra is seriously injured during the battle, and thus summons Princess Cobra for backup. After this episode, the character reappears in many episodes after.

Princess Cobra isn't actually entirely evil, for she does things that could either be considered good or evil. The reason for this is unknown, but possibly because her mother was good, and as obvious in the show, her father is evil. It is best to say she's neutral.

Ranfa
Princess Cobra disguised as a woman named "Ranfa".

Katana
Princess Cobra wields a katana as her primary melee weapon.

Red Thread
Princess Cobra can spew a red thread from her mouth to pull enemies toward her.

Dark Ghost
Princess Cobra can emit a strange darkness within the area. This is used to drain Diamond Eye's power. This ability is titled the "Dark Ghost".