Indigo Keen: Indigo Keen is a Magical Girl, is one of the Seven Mermaid Princesses, the main characters of the Rainbow Bubblegem series. She is the seventh and final Princess to awaken to her powers, but serves as the tetartagonist.

Personality

Though naturally laidback and quite mysterious, Indigo is very hostile and untrusting towards others. She is the sole survivor of her kingdom's destruction at the hands of Black Diamond, and ever since, she carries a huge amount of trauma. Because of this trauma, Indigo pushes people away from her. Deep down, however, Indigo is a good friend and tries to help out whatever way she can.

Physical Appearance

Indigo has dark skin, indigo eyes with indigo crescent moons and wavy indigo hair, with half of it in the shape of a crescent moon covering her left eye.

As a Human

In her human form, she wears a yellow ring with the moon symbol, a light indigo hoodie with a crescent moon, a black skirt underneath it, indigo socks and dark brown boots.

As a Mermaid

In her mermaid form, she wears a light purplish-blue tiara, an indigo tank top with a navy blue crescent moon and an indigo mermaid tail in a shape of a crescent moon. A golden band is wrapped around the tail near the fins.

As a Magical Girl

In her magical girl form, she has rainbow in her eyes and she has purple and blue highlights on her hair. She also wears an indigo top hat, an indigo dress with a rainbow crescent moon, indigo gloves and indigo tall boots with thick rainbow outlines.

Magical Girl (Power up)

Colorful embroidery and small old moon-shaped jewels were added to the outfit, and the neck collar was changed to the shape of fluttering flower petals.

Wings and a ribbon surrounding the old moon-shaped gem were added to the top hat.

A layer and a frill were added to the existing skirt, and the length of the dress's swallowtail was extended.

The old moon symbol on the pupil has been enlarged, the color of the eyelashes/pupils has changed to navy blue, and the light navy/purple bridge of the hair has become darker.

The existing weapon, Shadow Stick, has been upgraded to Shadow Sword.

Powers & Abilities

Shadow Cane - Indigo Keen’s main weapon, allows for Indigo to manipulate shadows. It can also be used as a bludgeon to hit her enemies, and is shown to be durable.

Shadow Bubble - Allows for Indigo to move through shadows. She resembles a shadowy blob in this form.

Shadow Pin - Indigo puts her cane on top of the shadow of a target temporarily freezing it in place.

Shadow Sword - Indigo Kin's new main army. Shadow sticks can attack enemies with a transformed fencing -type weapon or swing a magic sword, and overpower all the opponents around them.

Spret Shadow - When the shadow sword is plugged into the ground, such as Shadow Pin, the shadows are divided into several branches, summoning the alter ego in the shadow and continuously attacking the opponent.

Guardian Fairy

Prickle: Prickle is Indigo Keen's fairy pet.

Appearance: Prickle is a sea urchin creature with light indigo skin and indigo eyes displaying crescent moons. His limbs and hair resemble spikes, though thicker and flexible, with the former being able to move of his own volition.

Powers

Prism Waves - Prickle defeat all enemies with one shot, only in emergency situations