It was implied that Sark was more spiderlike so it could be half human, half animal cross breeds?

Would also throw in Shakespeare's Ulysses speech as very closely tied...

ULYSSES
Troy, yet upon his basis, had been down,
And the great Hector's sword had lack'd a master,
But for these instances.
The specialty of rule hath been neglected:
And, look, how many Grecian tents do stand
Hollow upon this plain, so many hollow factions.
When that the general is not like the hive
To whom the foragers shall all repair,
What honey is expected? Degree being vizarded,
The unworthiest shows as fairly in the mask.
The heavens themselves, the planets and this centre
Observe degree, priority and place,
Insisture, course, proportion, season, form,
Office and custom, in all line of order;
And therefore is the glorious planet Sol
In noble eminence enthroned and sphered
Amidst the other; whose medicinable eye
Corrects the ill aspects of planets evil,
And posts, like the commandment of a king,
Sans cheque to good and bad: but when the planets
In evil mixture to disorder wander,
What plagues and what portents! what mutiny!
What raging of the sea! shaking of earth!
Commotion in the winds! frights, changes, horrors,
Divert and crack, rend and deracinate
The unity and married calm of states
Quite from their fixure! O, when degree is shaked,
Which is the ladder to all high designs,
Then enterprise is sick! How could communities,
Degrees in schools and brotherhoods in cities,
Peaceful commerce from dividable shores,
The primogenitive and due of birth,
Prerogative of age, crowns, sceptres, laurels,
But by degree, stand in authentic place?
Take but degree away, untune that string,
And, hark, what discord follows! each thing meets
In mere oppugnancy: the bounded waters
Should lift their bosoms higher than the shores
And make a sop of all this solid globe:
Strength should be lord of imbecility,
And the rude son should strike his father dead:
Force should be right; or rather, right and wrong,
Between whose endless jar justice resides,
Should lose their names, and so should justice too.
Then every thing includes itself in power,
Power into will, will into appetite;
And appetite, an universal wolf,
So doubly seconded with will and power,
Must make perforce an universal prey,
And last eat up himself. Great Agamemnon,
This chaos, when degree is suffocate,
Follows the choking.
And this neglection of degree it is
That by a pace goes backward, with a purpose
It hath to climb. The general's disdain'd
By him one step below, he by the next,
That next by him beneath; so every step,
Exampled by the first pace that is sick
Of his superior, grows to an envious fever
Of pale and bloodless emulation:
And 'tis this fever that keeps Troy on foot,
Not her own sinews. To end a tale of length,
Troy in our weakness stands, not in her strength.

You could bring in every small creature that Harry has ever annoyed/ignored.  There are quite a few out there that would be thrilled to have a teeny Harry to chase after.  Serack -- very glad you like the idea.  I am not sure it fits into the great sequence that is being written, but you never know!

15:  Heist
16:  Time Travel
17:  Lewis Carroll riff
18:  Asgard/Interplanetary Travel

Ok now, I am getting a little off topic, but still the fact that book #15 is a heist really opens up the possibilities.  And the great thing is Harry fixes LC but in a completely unexpected (and urgent) way.  The ticking time bomb of old Harry getting ready to cast the spell while little Harry tries to scale small buildings and fix the city is pretty fun as a premise.

Pure rambling theory based on the thread:

Book 17:  Rabbit Hole

Stranded and imprisoned in time by the betrayal of his closest allies, Harry Dresden, has been searching for an escape route for over a year.  His only hope for salvation rests with the most unlikely of solutions.  Now he is trapped at 1/22nd of his natural size and stranded back in time inside of Little Chicago -- the experiment he had cast off and though abandoned years ago.  But he is not alone -- something stalks the streets of Little Chicago -- and Harry will have to delve deeper into its mysteries before escaping the Rabbit Hole.