Default appearance:

gurren-yoko, yoko littner, red hair, long hair, ponytail, yellow eyes,

rifle, sniper rifle, anti-materiel rifle,

Pre-timeskip:

yoko-pre-timeskip, thighhighs, bikini top only, flame print bikini, underboob, shorts, short shorts, gloves, scarf, belt, elbow gloves, midriff, hair ornament, skull hair ornament, belt, white belt, studded belt, thighhighs,

Post-timeskip jacket:

yoko-post-timeskip, jacket, maroon jacket, thighhighs, shorts, short shorts, black shorts, bikini top only, flame print bikini, breasts, underboob, navel, midriff, belt, white belt, studded belt, boots, thigh boots,  

Teacher:

yoko-teacher, shrug \(clothing\), long sleeves, white sleeves, pink shirt, teacher, glasses, bespectacled, aged up, necktie, hair down, skirt, long skirt, brown skirt, alternate hairstyle, puffy sleeves,

Space:

yoko-space, tube top, cleavage, bandeau, strapless, yellow eyes, star (symbol), midriff, navel, cape, tights

Swim:

yoko-swim, sarong, print sarong, swimsuit, yellow swimsuit, breasts, midriff, tankini, 

OVA stewardess/uniform:

yoko-ova-stewardess, garrison cap, hair down, alternate hairstyle, uniform, midriff, miniskirt, navel, necktie, orange necktie, gloves, pencil skirt, crop top, long sleeves, collared shirt, teal jacket, teal skirt, armband, 

OVA casual:

yoko-ova-casual, tank top, orange tank top, crop top, midriffshort shorts, star (symbol), shorts, blue shorts, cleavage,

OVA lingerie:

yoko-ova-lingerie, halterneck, choker, lingerie, black lingerie, o-ring, o-ring harness, criss-cross straps, black elbow gloves, fishnet thighhighs, fishnets, garter straps, hairband, short shorts, hair flower, alternate hairstyle, hair down, star (symbol), knee boots, high heel boots

Yoko Littner, the rifle-wielding tritagonist from Tengen Toppa Gurren Lagann (my personal #1 favorite anime).

There are already several good Pony Loras for this character but not for Illustrious, so I figured I'd throw one together.