The one who answer's Kaguya's 3rd will get growled at by me.
Well, I like several nonspells. Remilia's opener from EoSD is nifty, I always liked it, and most of Remilia anyway. But I don't know if it should be taking the #1 spot. At least the #1 spot from EoSD, let's say.
PCB has quite a bit of cool noncards. Namely everything Yuyuko has, sans maybe the streaming ones, which look nifty, while are a bit boring. I always hated Merlin's opener, but it looks cool, I have to admit that. And then we have Yukari and her kunai. How sexy, sexy kunai they are. Oh yes, I like those kunai. Especially the ones that include some dodging, not only streaming. But the streaming ones look cool as well!
IN has some nifty stuff, Reimu and Marisa's nonspells were made rather well in my opinion, suiting the charachters in style. Mokou has... fun to dodge noncards, and then some really brutal noncards. But I always liked dodging amulets, no idea why, but yeah.
MoF... I don't really know, I don't play it enough. :V
SA could be the same, but at least Utsuho has some cool-looking shit. And maybe Orin & Koishi fall into the nifty looking patterns as well.
UFO was made with a blargh. I never liked Nazrin's, nor Kogasa's nonspells. I've learned to gehh at Ichirin's noncards, when scoring, and Murasa's raindrops never were made for me. Shou's lasers can GTFO like just now. Byakuren has couple of nice ones, but also has a couple of patterned and too easy noncards. Nue was.... I don't know, weird? She has a lot of different bullet style-noncards, and I never liked most of them.
And then we have TD. I had to think a while, but I remember ultra-Mamizou's noncards being HAHAHAHANOPE. Probably nothing from TD. The game was not my thing that much, so I haven't played it enough to tell if some of the nonspells are interesting or not.
And so, I ended up picking some favorites from every game. Or not every, but yeah. I can't really decide here, too many cool noncards to go for.