I'd say that it has never occurred to me that Kann-E is physically a "child". She looks like a young woman to me, actually. After all, she stands out as the most physically mature of the known padjal. E-Sumi-Yan might arguably be wiser in some respects, but he clearly looks like a boy to me.

I'm not sure if that's because I'm East Asian and therefore look for different cues of physical maturity. I've seen comments, for example, of how female miqo'te look like teenage girls and, again, that had not previously occurred to me before.