For Light Blue I guess you are refering to Medium Blue (Gali secondary color). I don’t think that color has been stablished in any Ko-Matoran. Templar animations showed Ko-Matoran with light blue, but Matoro was shown with that color, and we know he was Sand Blue, so my guess is that all those Ko-Matoran were also Sand Blue.
I have a theory that Black isn’t a “canonical” Ko-Matoran color. Sure, we see Pakastaa and Talvi with “black”, but I belive that in reality is dark grey. Dark grey is a Ko-Matoran color since Kopeke has that color, but we don’t see any other Ko-Matoran with that color, why would be Kopeke so unique? (Kopeke Av-Matoran confirmed), and in MNOG2 he was miscolored as Light Gray, so we don’t have a good comparison for Dark Gray in a Ko-Matoran.
But hey, that’s just a theory, a BIONICLE theory.
But Medium Blue and Black are acceptable for a Ko-Matoran.