She's a witch! Burn 'er!

Oh wait there's a lot of you...

Alice and Shanghai behind Schierke.
And why not have tag char Louise.

Still missing about 12 character/series to tag, tried my best at pointing who's who in the zoomed view.

Not so sure about the Flying Witch one.

No idea how to edit the name tags, so...

Mahoujin Guruguru's character is Kukuri
Ojamajo Doremi's is Doremi Harukaze
Patche's name is Patchouli Knowledge
Kiki's Delivery Service is... well, Kiki

...I wonder if I'll ever see Kagari Atsuko and Kagami Atsuko together in a crossover picture...

Pretty sure I see Dark Magician Girl's hat in the background.

I'm guessing Ichihara Yuuko from xxxHolic besides Beatrice
For the Pipe and black Hair.

Found a few, but there's still a lot missing.

Edit: It seems we're down to these six. Any ideas?

Of all the things I never expected to see, it's Twilight Sparkle and Bayonetta in the same picture.

Down to the girl with the sunhat between Scarlet Witch and Zatanna (provided all the others were correct). This helped:

https://i.pximg.net/img-original/img/2017/06/12/00/16/18/63343227_p8.jpg

Can't find Marisa for some reason...

Of course Louise, Akko, Megumin, and Yukari would be blowing something up.😏

Edit: And Lina Inverse is looking on in amusement and/or approval. Maybe she’ll try teaching them the Dragon Slave…

boomersooner said in comment #2013344:

Can't find Marisa for some reason...

The artist qualified that only one character per series would be included, and it looks like they preferred Patchouli to Marisa.