Ariel

Ariel is the romantic partner of Gaster (due to their marriage previously being voided due to their circumstances years ago), mother of Sans and Papyrus, and the adoptive mother of Shae.

She was the Royal Guard Captain before Undyne until Gaster fell into the CORE and she left due to despair. Years later, she returns permanently, and continues to live with her family. She is now Second-In-Command of the RG and trains Papyrus, who she had allowed to join the RG under her supervision.

Appearance
Standing at 5'10, Ariel is an average height skeleton with a striking resemblance to her youngest son Papyrus, except she has pupils and a more pointed jaw). Her build is curvy. She wears a Paris M violet zipped-up jacket with a old rose red Delta Rune on it with black leggings and Paris M violet boots. She had a red-orange scarf that she wore until she abandoned the family after Gaster had fell into the CORE, in which she it gave to Papyrus before she left.

Personality
Ariel is a very caring and motherly person. She cares deeply for her family and rarely genuinely loses her temper unless her family or friends are in distress or she is very paranoid and is under stress. Unlike her husband, she loves puns. Like her oldest son, Ariel is considered a "motherhen", as she can sometimes smother her children and others with motherly concern.

Pre-SHAETALE
At some point many years ago, Ariel was the captain of the Royal Guard. She met Gaster and eventually married him. They have their first child Sans and years later she gives birth to Papyrus.

One day, Gaster got shoved into the CORE. This lead to the family crumbling apart, including Ariel leaving, essentially leaving Sans and Papyrus to fend for themselves. At some point, she became the River Person, grieving for her husband for years and drowning in her regret of leaving her family, thus she hid her own identity and never took off the robe.

Abilities
Ariel has all standard monster abilities and skeleton monster abilities, including ones exclusive to the skelefam. Thanks to her training, her magical ability is enhanced and stronger than normal.

Trivia

 * Despite being named after the font, Ariel spells her name differently from it.
 * Arial is the proper spelling.
 * It is revealed in the Spinoff AU, SKELESIS, that Ariel's parents spelt it differently by mistake.
 * This is a reference to The Narrators previously misspelling her name for 4 years, dating back to 2016, and not bothering to correct it.