Solaseed

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

Appearance
Solaseed appears to be a 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 she later sat on top of the highest wall and sang a song with her guitar at the carnage and massacre of many participants by the mercy of the Earth Crawlers.

Solaseed manages to reach the end of the labyrinth where Drole and Gloxinia recieves all the participants. There, Solaseed states how Gloxinia kills all the other who still in the Labyrinth, claiming that all the life there is vanishing. When the tag teams are formed, Solaseed is paired with Howzer.

Solaseed is taken as hostage by Drole along with everyone besides Meliodas, and later teleported to Liones by Gilfrost.

Prelude to the New Holy War arc
Solaseed reappears, with her body under possession of Sariel, one of the Four Archangels, to help the Holy Knights fight against the demons.

It is revealed by Sariel, that some time after the Great Fight Festival, Solassed fell victim to a serious illness that put her on the verge of death. There, the Archangel manifested through her lute and offered to cure her illness in exchange for her allowing him to use her body to fight the demons. In the end, Solaseed agreed.

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.