Gonna be ranting about something that most wouldn't really care about but bugs me.
Unfitting witch types. When it comes to all witches, they have a witch type. Gertrud is the rose garden witch, Charlotte is the sweets, Oktavia is the mermaid witch, and when you look at their designs, you can tell why.
Though, there has been some recent designs in the last few years that don't fit into this. Here's what I think are the biggest offenders and how I'd do them.
Paola, in-canon, is the witch of rubber. While yes, it makes sense, buoys are typically made of rubber and all, it's a rather broad term for it. I'd personally make Paola the witch of flotation which is much more direct.
Frederica, the witch of Mitsuru Inami, is the witch of compound eyes. While Frederica is an entity completely made of eyes compounded together, the term compound eyes is typically however used to refer to the eyes of insects such as flies.
I'd personally make Frederica, the saccade witch, a saccade being "a small rapid jerky movement of the eye especially as it jumps from fixation on one point to another" which is what Frederica does in its attack as a Doppel.
I know it's a rather odd thing to make it the witch of... but I mean, we have a witch of curtain rails.
Blot, the witch of Gunhild, is known as the shipwreck witch. However, the witch features no sorts of capsized ship or ship in general in its design. Rather, it resembles a beast that would wreck said ships. A more fitting type would be the kraken witch, based on upon the infamous sea monsters from Norse legend.
Carmen, the witch of Tsubaki Mikoto, is the shrine gate witch. While its clear on why its form is a shrine gate in the doppel... however, in the actual witch--
No shrine gate is featured in its design at all. I would personally assign it as the shinboku witch, a shinboku being a sacred tree worshipped on shrine grounds, still befitting with the Japanese shrine theme.
An infamous witch that only had its name revealed recently, Asiphae. Asiphae is the bovine witch. Unlike the others, the witch type isn't as unfitting and is just a personal frustration for me. Since the ax itself is the actual witch and not the minotaur... shouldn't it rather be the ax witch instead?
The last one I will cover is Martina, one of only two Doppel Syndrome Doppels added to Magia Record. Just like with Asiphae's name, the latest Magia Archive revealed that Martina is the balloon witch.
...
Couldn't they have gone with some kind of coat witch for it? Because I feel like a balloon witch would... go in the direction helium-filled rubber kind? This one really annoys me the most. It could just be a mistranslation however, it's still not certain.
Now there's still a few more minor cases when it comes to these, but I feel like they're not enough of bothers to bring up. However, to comment if you have any that really bug you when it comes to the hyper-specific issue of witch types!