Smaller characters do not block line of fire to larger characters. Since the giant is larger than the standard character, line of fire is not blocked.
Also, capitalizing every word makes your text a lot harder to read.

So it doesn't matter if i draw LOF to a square or a character? If there is a smaller character than the attacker between the attacker and the target or the target's square the LOF is clear? Am I right?

So it doesn't matter if i draw LOF to a square or a character? If there is a smaller character than the attacker between the attacker and the target or the target's square the LOF is clear? Am I right?

No, it does not matter. You are right.

Thanks very much for the help.