All of the hate the W.I.T.C.H. tv show gets. We get it, it strayed far
from the source material but it isn’t the worst thing ever, and there
are definitely show worse than it
This was done as a nod to Sailor Moon. The reason Lucia’s hair isn’t pink is explained in the manga. Also, all the North Pacific mermaids (including Lucia) don’t have pink hair or eyes is shown in episodes 1 and 13.
Girls, Magic, Sparkles, & More 