Gurren

Gurren (グレン, Guren), is a one of a kind Gunmen altered from the "Gunzar". It is the second most prominent mecha in the show, and it form the body of the titular mecha Gurren Lagann.

Plot
After attacking Littner, the mech is subsequently captured, rebuilt, stylized and named by its eventual pilot, Kamina, who had the Gurren's original swords converted into massive sunglasses similar to his own that could be used as a blade or boomerang in combat.

Powers and Abilities
Being of typical Gunmen proportions, Gurren is able to fight without the Lagann's power. While its individual power was initially not on the same level as advanced Gunmen/pilot pairs, such as Viral and his Enki, Kamina eventually became experienced enough to hold his own against multiple enemies. After Kamina's death, Gurren was mainly piloted by Rossiu and one-time pilots until the aftermath of the battle of Teppelin, pilotless until Viral becomes the Gurren's official pilot during the battle against the Anti-Spirals.

While paired with Lagann, Gurren is able to produce drills from nearly any part of its body, and is able to use these drills to combine with other mechas such as Cytomander 's Gunman bomber's and Arc-Gurren, the former combination giving Gurren the ability to fly from that point on.

Etymology
Gurren (紅蓮) means "Crimson Lotus". As homage to it, a white Gunzar unit is seen during the battle of Tepplin, sporting a pair of pistols rather than blades.