[Rosie] A child? NO
[Raak] Children's book? NO

[GL] Title character? NO

[Rosie] Literary? YES

[Rosie] On reflection "literary" can be taken by some people to mean "from great works of 'Literature'", although I don't know how one would define them. The AotC is a character from fiction, and I have seen her mentioned as a "literary character", although I wouldn't rate the "literature" as "Literature", but some probably would. In all, she's a character from a book or books.

[gil] C19? YES, but not exclusively.

[Raak] In English? YES
[GL] Mrs Hudson? When one has eliminated the impossible, whatever remains, no matter how improbable, is indeed Mrs Hudson. CORRECT. Congratulations!

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Hmm... OK, next up is: ABSTRACT with ANIMAL connections.

[Phil] Human? - No.

[Rosie] A characteristic of a particular animal? No, but there is a connection.
[Phil] Fictional animal(s)? Yes

[Knobbly] Mammals? Not primarily but some.

[Raak] Talking animals? Thankfully, No.
[Dujon] Cast of a particular children's book? No.

[Raak] Real animals? Yes. (Or at least something similar in most cases)

[Software] Native to UK? Some might be, others certainly aren't.

Fictional animals of multiple species almost all of which are non-mammalian and in as far as they can be identified, are probably based on real animals but not UK natives (probably). They are not from a children's book and they don't talk. The character of the animals is important but is not likely to be guessed in a "____ as a [Name of animal]" sense.

[Dujon] originally from a book? No but apparently books have been made since (including children's books)

[Raak] Mythical? No.