Not an insult, just something funny, but the fact that nobody has mentioned Nat's sparkly, fluffy giant wings in PG surprises me.

‘Watch where you drop those chippings,’ Faquarl snapped. ‘That last shower went down my neck.’
‘Sorry.’
‘And you might wear a longer skirt while you’re about it. I’m afraid to look up.’
I paused in my chiselling. ‘Can I help it if this is the current fashion?’

^not really an insult, but gave me a good laugh

Queezle7 wrote:mostly her mary-sueness.

I don't really consider Kitty a Mary-Sue, 'cuz she's far from perfect. I just hate how she mugged Natty in the first book...
And the way she thinks that she's so much better than everyone else

The entire Bart sequence is LOL.
Especially The Ring Of Solomon. Classy!

I like this part:

Barti: For my part, I agreed to this proposal on the assumption that my host would be of moderate physical quantity. Now, having viewed him, I'm having doubts.
Nat: What's that supposed to mean?
Barti: Well, you wouldn't buy a horse without seeing it,would you? I'm allowed an inspection. Let's see your teeth.

Had me banging my head on the pillow, that one did. xD

Bartimaeus: "Your skin's been steaming gently and the end of each hair's been glowing at the tip. Your aura's gone haywire too. Well, it's a delicate process, ridding yourself of a charge like that. I wanted to wake you straightaway, but I knew I had to wait several hours to ensure you were safely recovered."

Nat: "What! How long has it been?"

Bart: "Five minutes. I got bored."

I love how Barti tries to tell Kitty what Nat was thinking about her. Hilarious.

A dozen more questions occurred to me. Not to mention 22 possible solutions to each one, 16 resulting hypotheses and counter-theorems, 8 abstract speculations, a quadrilateral equation, 2 anxious and a limerick. That's raw intelligence for you.

Not an insult, but still hilarous.

PG ch36 fn2: That's how it was with Nefertiti and Akhenaton, of course. One momento it was lingering looks and assignations by the crocodile enclosure; next it was tearing up the state religión and moving Egypt's capital 60 miles into the desert. One thing just led to another.
PG ch32 fn1: We each strove to make the sounds curt, assertive, growling. Neither quite succeeded. His voice had the kind of pitch usually reserved for bats and dogwhistles, while mine warbled like that of an elderly spinster requesting a cucumber sándwich with her cup of tea.

The first isn't a direct insult, but still.