We have two tags, katase_yuu and yu-katase. The names are suspiciously similar, but both tags are small enough that there's no overlap, making it hard to decide if it's the same artist. The style is similar enough, but again, nothing to be certain. Does anyone know if they are, indeed, the same artist? If so, yu-katase should be aliased to katase_yuu, as it's the correct romanisation and almost surely the correct name order.
Updated by jxh2154