Solaseed

is a troubadour who joined the Great Fight Festival for an unknown purpose.

Appearance
Solaseed appears to be very short young woman who wears a cap, coats, and carry around a guitar with her.

Great Fight Festival arc
After accepting the invitation to the Great Fight Festival at Vaizel, Solaseed entered the labyrinth where he later sat on top of the highest wall and sang a song with his guitar at the carnage and massacre of many participants by the mercy of the Earth Crawlers.

Prelude to the New Holy War arc
It is revealed that Solaseed possessed by Sariel of The Four Archangels, he appears to help the Holy Knights fight against the demons.

Abilities and Equipment
Solaseed's equipment consists of a lute that she is always carrying with her. One of the Four Archangels of the Goddess Clan, Sariel, rests inside.

Trivia

 * Solaseed's guitar appears as one of the relics that Meliodas mentions when talking about the Goddess Clan residing within objects in an omake in Volume 24, hinting that there could be a Goddess residing within it.