As long as you don't make the gijinka suck, and the best way to do that is to accurately fit the chracter as a human.

/cgl/ mostly hates shitty "bikini top and booty shorts" gijinkas. If you're doing a male character, you should be safe.

Your issue would be making it recognizable. All you have to work with is solid black with a red bandana around your neck. That might be all you need, but if you're unsure, bring something that references Nichijou.
Maybe have a female friend cosplay.. the girl in the OP-pic (I've never seen the anime, I'm sorry) or have a prop that people would tie to him? Something like that.

Yeah, if you plan on going with a group, or just the professor then you should be good. Only die hard fans would be able to make that connection, else you'll be another kawaii uggu neko.

>>6619653
Good point on the recognizability. I'll have to see if one of my female friends would be up for cosplaying the Professor. I was also thinking that it might be fun to have a few props like the prank gum or a tissue box.

>>6619625
I was thinking that since he's generally a bit haughty and tries to come across as mature, a Sakamoto gijinka would be a pretty snappy dresser. Possibly black dress pants, with a black waistcoat or sweater-vest on top of a white or grey dress shirt? Then the bandana and cat-ears would finish off the look.

>>6619679
That looks good.

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>>6619679
Oh wait, I found something on google

>>6619804

That's pretty much what I was envisioning. I'm not sure about the lab coat, though - although I could make a Shinonome Laboratory logo to go on the back of it.

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I personally like this one, with the same school uniform as the other male characters wear.

>>6619966

Isn't that just Minoru Shiraishi (as he appeared in Lucky Star) with Sakamoto's bandana, though? It's a clever VA joke, but I don't know if it's meant to be a gijinka...

>>6619631
This. I personally like ginjjinkas for the most part, especially if it's executed well.
>>6619679
If you can't find someone, you could just make a professor plushie to carry around. Either way, I think that mostly only fans of the series will know who you are.

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Check out Nyanpire gijinkas, these might help you get some ideas.

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>>6620502

>Professor plushie

GENIUS. I suck at making plushies, though, so I guess I'll have to commission one. And I'm fine with not being recognized by everyone - Nichijou isn't the sort of show that has a huge presence at cons, anyway. I'll be content if people who've seen the show recognize it and are amused by it.

>>6620737

Incidentally, does anyone on /cgl/ know any good commissioners for plushies?

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>>6620737
Was also thinking you could also make a crow prop. Probably could make him from paper or foam, even, if professor is too difficult.

>>6622585

You guys are on a roll as far as good ideas go. I've contacted a couple of commissioners on DA about the cost of a Professor plush, but if that proves prohibitively expensive, I'll make a crow to perch on my shoulder. It'd probably look nice if I kept the cone shape, but used fake feathers. Either way, though, I'll probably keep one of those prank snapping-gum things in my pocket for photos.