Sorry for the 'late-ness', but I just saw this topic now.
Here's a little something about Lunk.
This is taken from
here.
Answered by Mr Warburton himself from an email I sent to him last year.
Q: I just watched op. FOUNTAIN (yes, i know... episodes in the
Philippines are WAY er... unrenewed ^^). And "Lunk" is another
Delightful Child (i assume). So you mean, there are other Delightful
Children besides the ones From Down the Lane?
A: i think lunk was only temporarily delighfulized in that episode. as
far as others, there's the interesting twins from beneath the mountain,
the rowdy hooligans from across the square, the annoyingly cute
triplets
from atop the hill, and the IFFATL (can't tell you that one yet)
Hope that helped in some way.