Since there are so many categories, I'll split this post up so it won't be too long.
A) Magic Winx
Favourite: Flora - There's something I really love about the style of her dress. I also really like the colour scheme. Hot pink + pink = I'm mesmerized. :D Oh, and her outfit's quite modest, which is pretty important to me if I want to wear something. Her sleeves make her look so elegant.
2nd Place: Stella - She has a unique scepter, a gorgeous colour scheme, a cool outfit style, and cute hair bunching. I also really like her "arm warmers". Gives her that "sporty" look.
Honourable Mention(s): Tecna - There's no way I'm not mentioning her in this. It's just so modest, unique, and therefore, beautiful. She doesn't have wings (or fairy wings, at least), and the style of her heels are just so...unique!
Favourite: Flora - I'm just TOTALLY mesmerized. TOTALLY. Her's is just so glamorous and beautiful. I love her tiara, and my absolute favourite out of her whole form is her dress. I just love how colourful and pink it is! It's just SO cute! Yeah, and not too revealing.
2nd Place: Bloom - I really love the style of her dress, and, again, not too revealing! Her colour scheme is also pretty and her wings, well, not as beautiful as Flora's, but still pretty eye catching.
D) Enchantix CGI
E) Seasons 1-3 Non-Winx Fairies
Favourite: Galatea - I don't really pay much attention to Non-Winx fairies that don't really spend much time with the Winx, but her's is really eye catching. It's so hard to believe it's only a Magic Winx/Charmix form! Musa should have gotten those wings! LOL...
2nd Place: What?! - Didn't I say I didn't pay much I attention to Non-Winx fairies who don't spend a lot of time with the Winx? I don't pay attention, that's why I don't have a 2nd favourite!
Honourable Mention(s): ??? - I don't even have a 2nd favourite and now you want an honourable mention from me? Seriously?