About Sol and Etri:
Names: Solei ("Sol") and Etri Celeste
(later Etri's surname becomes Travellarri)
Home Country/Region: Montglace
Birthdate: Stele 32nd, 436 (Equivalent of February 2nd)
(They're 24 at the time of "Unexpected Inspiration")
Astrological Sign: Aquarius
Tarot Cards: The Sun and The Moon
Appearance quirk: Sol has sun tattoos on his hands and forearms
Occupations: fire-breather and fire-eater / Lightbringer and Shadowwalker
Alignment: Chaotic Good
Favorite Colors: yellow and navy blue
Sol and Etri are mages of light and shadow who use their fire performing act to hide their true abilities. "Celeste" is the surname they picked when they became performers, chosen because of their act's sun/moon theme, and Solei ("Sol" for short) is also an assumed name. Etri's real name is Etraunjei, but he only ever goes by the shortened version.
As their lingering accents, strange names, and pale features can attest, they weren't originally from Concordia. In the country of Montglace are cities far below the snow and ice; it was at a temple in one of these underground cities that the twins were born. They were raised by the priest/esses of Shadow, along with the other children born into the order, and when Etri began to show signs of possessing this kind of magic, he became an acolyte-apprentice. Etri was content with the prospect of becoming a priest someday, but Sol was never truly happy. While it was assumed for many years that Sol lacked magic, the truth was that his power surfaced at the same time Etri's did. Sol, however, kept this a secret. If he had let on that he possessed the opposing light magic, he would have been sent to the temple of Light, which would have meant permanent separation from those he cared about.
This didn't go as well as he'd hoped. Sol and his boyfriend, a young- and reluctant- Shadow priest, were discovered making plans to flee the city together. This was forbidden to those with religious vows and in the process of escaping, his love was killed and Sol was only able to get away by using his hitherto hidden magic. Forced to make the choice between loyalty to his brother and loyalty to his future order, Etri picked his brother and fled with Sol so that he could protect him on the long, cold journey south.
As they traveled, Etri began to acquire the skills of a thief and pickpocket, using his shadow magic to steal what they needed. Sol, meanwhile, went back to doing the one thing that had always made him happy and had largely been denied to him at the temple: tinkering with discarded objects to turn them into art and functional contraptions. Between what Etri stole and what Sol made, they were able to keep themselves fed and healthy as they traveled. It wasn't until they reached Concordia and ran across a young woman skilled in thievery that they found a home, however. Sympathetic to the brothers, she introduced them to her carnival troupe. She became Etri's thieving partner and with the help of the other carnies, Sol and Etri learned fire-breathing and fire-eating. These tricks directly tied into their light/shadow magic, so fire performing was the logical career choice. They stayed with this stationary troupe for a while before Sol's wanderlust led them to join a roving troupe instead.
Sol took well to the life of a performer and quickly became friends with the other carnies, possessing the charisma and sunny personality that matched his flavor of magic. Etri, always introverted and somewhat socially anxious, was never as comfortable with the performance occupation as his brother. When Adair bumbled his way into their lives, the sympathetic twins readily agreed to come to the aid of a fellow mage in trouble. Sol, ever friendly and social, got along well with the similar personality the artist possessed, and even Etri was willing to befriend the easygoing Adair who never so much as blinked an eye at his strange quirks.