I know about the purple because she had it during the start of Dragon Ball. Trunks also mirrors her original color but I have never seen the seafoam color and watched all of Dragon ball/ Dragon ball Z but none of GT. Is it on Manga cover art? I wouldn't be surprised, that girls hair changes every Arc . Pointless wig colors aside, the cosplayer is amazing! If only this is how Bulma looked in that horrible live action movie they butchered.