Is it legal to move through one of your own figures that's in the second ring of a giant fig's "adjacent" squares so you can base the giant fig directly?

basically:

XXGXX
XX1XX
XX2XX
XX3XX

G is my opponent's giant fig. I have a charcter with charge at 3, and a character at 2. Can the character at 3 charge through 2 to 1? Just wondering since normally my character would stop when it hits 2, and it can't legally stop there(since I already have another character there) if I can finish the move forward, I'd assume not, but figured I'd double check.

No you can't. Once a non-flying figure comes within 2 spaces of a giant figure his movement ends. If he went through an ally's square he would have to stop inside that square. Since that isn't a legal spot for him he cannot enter that space.

Its just like moving through an ally's square while they are on Hindering terrain. Since you must stop when entereing hindering terrain (non-flyer without powers) you cannot enter that square if a figuer is already there.

Hope that makes sense.