I like how Keiko and your old team dealt with this old shame of yours (especially the "chibi versions").

Alas, you still have this a/an problem I may have mentioned previously:

Corolla rubbed her chin in thought for a bit before opening an holographic window.
Should be "a holographic window" (you got it right the other four times).

KITT is black and can move silently, but it’s still a car going around in a empty city.
Should be "an empty city".

That’s an heavy-duty military truck.
Should be "a heavy-duty military truck".

"Hm? What’s funny?" Corolla asked, raising a eyebrow.
Should be "an eyebrow".

Other technical errors I noticed:

The quartet ended up in front of big, generic palace surrounded by a tall wall.
I guess there is an "a" missing.

Icy looked like she wanted to say something, but the bad writing was clearly affecting her thought processes. "Uh... Yes. Go on with your your patrol," she managed in the end.
Well, that may actually be the bad writing affecting Icy’s speech process, too.

"Ok, where the hell we are?" Sergio asked.
"I wonder where we are" would be correct, but in a question, word order should be reversed: "Ok, where the hell are we?"

HG

Would you like another pair of eyes to go over this? Because I'm noticing a lot of errors as I read, mostly involving the punctuation around quotations.