Gawain

is one of the Four Knights of the Apocalypse.

Appearance
Gawain is a rather tall, well-built young woman much taller than Isolde, with dark short hair.

Gawain wears a full suit of white armor with gold trimming and a face-concealing helmet.

Personality
Gawain is secretive as she didn't remove her armor for the entire time that Tristan escorted her back to Liones and after Tristan had left her inside the castle alone, she immediately fled and ditched her armor since nobody knew what she looked like underneath and allowed her to blend in with everyone else.

From first appearance, Gawain is noted as being a rather kind person, as she tried consoling Isolde, who ran from Tristan out of embarrassment. It is shown that she prefers women over men, as seen during the same conversation with Isolde, having no issue running her hands down towards her waist, then attempting to discuss love with her.

History
At some point during Percival and his team's journey to the Kingdom of Liones, Tristan had found Gawain and discovered her as the last member of the Four Knights of the Apocalypse. He escorted her back to the castle where, for unknown reasons, Gawain fled the scene after Tristan left to take care of an incident within the city.

At some point after this, Gawain ditched her armor since nobody knew what she looked like underneath, allowing her to blend in with the citizens of Liones wandering the streets.

Current arc
After having been brought to the castle by Tristan, Gawain fled the scene and ditched her armor on the side of the road so nobody could find her. After noticing her absense, Meliodas sends Lancelot to inform Tristan, Percival and the rest of Gawain's disappearance. During their conversation, Lancelot reads Tristan's mind and realizes that Tristan is hiding something to which he reveals that Gawain is a blood relative to their enemy, Arthur Pendragon.

Despite Gawain's connection to their enemy, Lancelot assures the others that Gawain is one of the Four Knights and that they must prevent her from escaping the capital. Tristan's Platoon takes the west gate, Percival and his team take the east gate and Lancelot takes the south gate by himself. Unknown to Tristan's team, Gawain passes by them unnoticed as she walks through the streets while the armor is now being worn by a Holy Knight Apprentice named Tantal, who found it on the side of the road during a walk and wanted to try it on.

Now without her armor, Gawain finds Isolde by herself on a ledge crying. Gawain attempts to consult her despite her reluctance due to her infatuation with Tristan. However, Isolde notices a fight going on in the east where Pellegarde is fighting against Pelliot and other Holy Knights of Liones and after being caught by Pelliot's magic, Perverseness, uses his own magical power to create an explosion which sends debris flying right at Isolde, forcing Gawain to use her power to shield her as she declares herself "Master of the Sun".

Abilities/Equipment
Gawain is described to have "golden magic". This power is revealed to be Sunshine, the former Grace of Mael and Escanor as she proclaims herself as the "Master of The Sun" it’s possible she got it after Escanor’s death.

Arthur Pendragon
Gawain is a blood relative of King Arthur.

Trivia

 * Gawain is named after the character of from Arthurian legends.
 * Gawain is probably a lesbian or bisexual since she says she wanted to "hit up" Isolde.