If your CHA modifier is greater then thier level would they count as 0-level for the toal levelsd effected by the spell?
Awesome Display (Su): Your phantasmagoric displays accurately model the mysteries of the night sky, dumbfounding all who behold them. Each creature affected by your illusion (pattern) spells is treated as if its total number of Hit Dice were equal to its number of Hit Dice minus your Charisma modifier (if positive).
A twisting pattern of subtle, shifting colors weaves through the air, fascinating creatures within it. Roll 2d4 and add your caster level (maximum 10) to determine the total number of HD of creatures affected. Creatures with the fewest HD are affected first; and, among creatures with equal HD, those who are closest to the spell's point of origin are affected first. HD that are not sufficient to affect a creature are wasted. Affected creatures become fascinated by the pattern of colors. Sightless creatures are not affected.
I would count them as 1 HD creature. I have no rules to go by, but that is how I see it.