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In a response to a fan question, Kent Mudle explained that he'd never worked on a version of the game that featured Asha as a character. He also explained in the same answer that he'd likely seen the concept art for Asha at the same time as everyone else when her concept art was released. 
Kent Mudle further elaborated about Asha's scrapping, explaining that he's not entirely sure she was meant to actually appear in the game as he'd never read a script what involved Asha. Mudle surmised that Asha was used as a template for potential artists for the development team, he explained that they'd provide a description of the scenario and the artists would draw based on that description, providing reasoning for Asha's various design changes as well as art showing her with Clementine in her Season 1 character design.