It certainly makes me notice these sterotypes in these shows- mainly thinking of precure..
Like Blues are always not just cool, but the really smart character, aren't they? Can't a cool character also get failing grades lol? Cool isnt the same as smart but they always are!
And for some reason the MC in precure has never been blue have they? Not that I recall.. Its normally pink right?
bar Nagisa- if she can be called the main of the 2- though she does have pink trimming.. Why are magic girl leaders always pink? Just because its the most 'girly'?
You'd think cool and smart blue would be a good leader? Is it they think people cant relate to blues?
Or leaders need passion?
@ Arcane I will point out Sentai isnt the same as magic girl. There is some overlap in colour associations, like blue- but most of the others aren't the same really. e.g magic girls are rarely red and the leaders are pink.
I think of three stereotypes when I think of blue-themed characters, either a) the kind and smart/intelligent one (Ami from Sailor Moon, Rikka from DokiDoki Precure) b) the "cool beauty" (Tsubasa from Symphogear, Ryuugasaki Umi from MK Rayearth, Aoki Reika from Smile Precure, maybe Haruka from Sailor Moon) or c) the "loud tomboy" (Erika from Heartcatch Precure and Aiko from Ojamajo Doremi, admittedly this is a rare one). Probably it's down to the association of the colour blue with calmness (more befitting thinkers), but also coldness.
And yeah, the PreCure leaders have been universally pink to some degree since Splash Star, but I think the general trend began when Sailor Moon's lead had a pink color scheme to her transformation (though her outfit's main colour is usually white with either red and/or blue in the mix and later yellow when it came to her Super and Eternal forms), around the same time Momoko from Wedding Peach also went for a pink scheme, later mahou shoujo team leaders/main characters such has Doremi Harukaze (and to some extent Utena Tenjou and Sakura Kinomoto) also usually went for pink as an image colour. And yeah in that case I think it's partially down to some good old "pink aisle" sexism, but also probably to differentiate themselves more from shounen series and sentai where the leader is usually red-clothed or in other ways associated with the colour red (Digimon's MCs usually are red-themed, either in their clothes or by an association with fire). And passion - or at the very least curiousity - but also kindness are just generally characteristics you see quite often in media from Japan when it comes to MCs (kindness being very much a common trait in Magical Girl MCs, they often tend to be the most reserved about fighting and only see it as a last resort and even outright killing as a line they never wish to cross).