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Do you remember anything else about this show? Like, for example, can you remember any specific scenes from the show featuring the character you're describing?
I remember some ditzy purple haired glasses girl from that time period (Gluko from Mon Colle Knights) bit not blue haired ones.
The best character is always the one-shot disguise.
There was a blue haired girl with glasses in Trollz...
And one in The Law Of Ueki... but Gluko from Mon Colle Knights is probably the only ditzy one.
If there is work page for it the work has probably been referenced on You Gotta Have Blue Hair.
This signature says something else when you aren't looking at it.
There was an animation in Murican TV that featured a ditzy blue haired glasses girl that ran in early 2000s, anyone know what it is?