While "normal" animals may be rare in the Avatar world, they're not at all an impossibility. If you would like to bring Cri-Kee, Khan and/or Little Brother, that's perfectly fine. Weird for some people who have never seen just a "dog" and what not, but still very possible.
As for Mushu, we understand it'd be great for him to arrive with Mulan, but he has enough characterization, history and voice to be apped as a separate character. So unfortunately, we have to deny the option to have him arrive with Mulan.
If you prefer to make an AU based on ATLA instead of Korra, that's also fine! She'll just be pulled in via the Spirit World like the other ATLA characters.
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While "normal" animals may be rare in the Avatar world, they're not at all an impossibility. If you would like to bring Cri-Kee, Khan and/or Little Brother, that's perfectly fine. Weird for some people who have never seen just a "dog" and what not, but still very possible.
As for Mushu, we understand it'd be great for him to arrive with Mulan, but he has enough characterization, history and voice to be apped as a separate character. So unfortunately, we have to deny the option to have him arrive with Mulan.
If you prefer to make an AU based on ATLA instead of Korra, that's also fine! She'll just be pulled in via the Spirit World like the other ATLA characters.