Kroos is a playable Operator in Arknights, the tower defence mobile game first released in 2019, where her relaxed personality and distinctive Japanese voice lines made short clips easy to share outside the game. Desu yo is a polite sentence ending she leans on for charm, similar in spirit to other catchphrase clips like Poi? Yuudachi shared by anime game fans. As Arknights edits spread on video platforms and soundboards, this cut became a standalone reaction, kept in use because non players still read its mood instantly.