River Sprite Little Legend

Why can't I upgrade the River Sprite Little Legend? It is my favorite one and I feel like I'm the only one who wishes I could upgrade it, even if it's the default Little Legend. It's not that I don't like the other Little Legends, but I wish the River Sprite Little Legend could have upgrades or variants just like _every other_ Little Legend does. EDIT: The Poll autocorrected to "River Spirit" instead of "River Sprite", I'm sorry.
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