LMW-tan is the moe anthropomorphic mascot of the Lost Media Wiki; also known as "gijinka" or OS-tan, this is when any concept (including a website) is represented as a cute anime/manga-like girl!
Previous website-based examples include Wikipe-tan and Trope-tan, so here is LMW-tan.
She was inspired by the protagonist of Cracks, a lost animated short which was possibly the most famous lost piece of media on the Wiki. She is thus also wearing green and white, which is the color theme of the website.
Originally, she was just some fanart done for fun, but gained enough appreciation to become the official mascot!
LMW-tan is a shy but curious and passionate little lady, who has a passion for old movies, TV shows, cartoons and even video games. If she learns of such a thing that is lost and impossible to view by the common people, you can bet she will do the best efforts to obtain it, for the greater good!
LMW-tan pixel art by MarsCat!
LMW-tan by Demobot!
LMW-tan by Purdy!
Another LMW-tan by Purdy!
LMW-tan channeling Rosie the Riveter by Drawtoonz Studio!
LMW-tan by CoolioDavid!
LMW-tan comic by TentacleBot!
LMW-tan by Worrybot!
LMW-tan by hippo2!
LMW-tan no Daibōken by RetroGameFan9000!
LMW-tan by Exprezz561!
LMW-tan doesn't seem to quite have her head... by Starviend!
LMW-tan 8-bit by TheYoshiState!
Alternate universe LMW-tan by Notelu!
LMW-tan by scuttleman1127!
LMW-tan by Crimmm!
LMW-tan dressed like Sly from "The Electric Piper" by Notelu!