Shad0w1and's Colors (when someone says "this were your true colors, huh?" it means like "this was your true self, right?". It's also linked to the title of the anime: "Myriads of Colors")
Shad0w1and's World (it has less impact but it is still relevant to anime and diff)
Shad0w1and's Insane/Extra/Another (classic and maybe boring, but it makes much more sense the current one in any case)
Shad0w1and's Souzou (from japanese, it means "imagination" and considering the anime and what it revolves around, it still fits)
This is what I could think in around 10 minutes of reasoning.
Imo all these options are way more fitting than "shadowland" (you're giving me a dictionary entry while I'm actually considering the anime and the title of things related to it to make some sense. Which is more related in your opinion? saying that your option makes more sense after my examples will mean you just don't care at this point btw, since it's clear which options make more sense now)