This one is of Kaito: It's good. Something weird about his head.
Another Kaito one: I love those eyes xD Good pose as well.
Here's one of IV: Again with them eyes and pose. I love it, favorite one so far.
One of III: He looks so sad. Also he looks a bit weird if you know what I mean.
Kaito and Orbital 7: Yep, a bit smudged. Maybe you were admiring your good drawing skills and you didn't notice it getting smudge xD Anyway good drawing, but one of his boots look weird. One of Katio eyes look larger than the other.
Overall good drawings. Needs more work on the small things like hands and feet.
Next time no smudging 
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