With the latest event, I suggest that a superhero tag could be created, including Arachnobuddy, Foresight, Broot, The Metal Soldierette, Robbie Raccoon and The Bat Billionaire. It could be used not only for missions, but also for the mission called "The Revengers", from this same event.
Furthermore, shouldn't Katie the Cupid have the angel tag, just like Alan the Archangel?

Cupid is a God. So no Angel tag.

And the superhero tag is nowhere ingame. Thats probably just something that happens behind the scenes to have an easier time making the list of crusaders for "The Revengers"

"About the superhero tag: would this replace the 'supernatural' tag for these crusaders or be an addition from your perspective?"

I don't see any reason for these tags to be mutually exclusionary.
Robbie Raccon, The Metal Soldierette, The Bat Billionaire and Arachnobuddy are not supernatural, but still are superheroes.

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"Cupid is a God. So no Angel tag."

That's 100% correct, but it still seems unfair to me.

i like some creatures not having human and animal and even not having male and female characteristics.
one can experiment on using nobody who is correct for missions and have as low a probability as possible, i have missioned and won 30%, and 50% ones, have not wasted a 10% and think it might not be possible as those usually need 5 crusaders and it's impossible to have nobody correct in some way.
but that's just me...

The one that actually bugs me is Sal and Val not having a human tag as well as an animal one since they are decidedly not 100% animal. The same argument could be said about Emo, but that doesn't bother me since Emo is always wolfed out so always an animal.

As for roborabbit, roboturkey, and roborudolf I understand them not having the animal tag. If they gave them animal tag then RoboSanta, The Exterminator, and 4,000 would have to be given human tags, or maybe a demon tag in 4,000's case.

The one I really don't understand is Henry. Why doesn't he have a demon tag?!

The definition of a ghoul: "an evil demon, originally of Muslim legend, supposed to feed on human beings, and especially to rob graves, prey on corpses, etc."

Oh my, I guess it's time for a little story:

When the original crusaders were in place, very early in the game, their gender, race and royal status was determined not by tags but by settings directly attached to them. You can still see these setups, i.e. on the wiki when checking these crusaders. The crusaders were either male or female. An animal, or human, royal or non-royal. Based on these settings abilities like Emo's Lone Wolf were calculated.

When CNE introduced missions last year, mission tags were introduced additionally to these settings. For quite some time, these tags were different, in some cases even contradicting to the settings, especially for animals/humans and crusaders somewhere inbetween. So, while abilities still checked for the crusader settings, missions were relying on the mission tags.

From my perspective this changed over time. First, new abilities of new event crusaders were relying on tags and other crusaders' abilities followed with an update. Especially changing abilities which relied on 'non-animals' or 'non-humans'. Today ablities, objectives settings and missions only rely on crusader tags as far as I can see.

The reason why I am writing this is the following: Please don't rely too much on a crusaders appearance, its name or what an explanation for a cupid, a ghoul or a cyborg might be.

Justin who is responsible for the games' setup, has mentioned the process how new event crusaders and their setup is. Key from my perspective is the ongoing wish to balance everything out while keeping some of the games' routines willingfull difficult to some extend. This is why Alan has been the only Angel. This makes it more difficult to start all of the missions requiring an angel with 100% at the same time. The same for magic and animal tags. While it might make sense from an optical/names/description point of view if a crusader has this tag, CNE might decide that there are too many magical crusaders already in the game at this point of time, or that the slot the new crusader is in, shouldn't get a magical tag to not make some objectives too easy or some abilities too overpowered when they rely on magic tags (as an example).

So, my suggestion is: If you want to try to understand a choice in tags, try to understand it from a gameplay's perspective. Maybe it makes some sense to introduce one or more elves to the game when the first of them has an elf-buffing ability. Maybe too many animals or robots would make some objectives too easy, some DPS buffs too increased or simply don't fit in the overall plan for the next two, three or even four new event crusader-pairs.

But it's not just balance, it's also forced imbalance. Having tags which are rarer than others is part of the challenge for the game. If you want an objective which filters on a single tag only to be more difficult than others, you need some tags which are rare compared to others, while on the other hand you need to have those tags represented in a certain number of the first non-event crusaders in order to not upset players who are new to the game and don't have access to all crusaders, yet.

Since you use Emo as an example:
He is one of the original 20. His main strength is his Lone Wolf ability and the massive DPS buffs he receives. You are forced to gather non-humans around him. When the game started, this meant to have all animals around him. This is part of the idea behind Emo, a strong animal-focussed formation which works with just a few crusaders supporting him. The myth around it, even that he is a werewolf ist just the nice package around the core from my perspective. I'ld even go as far as saying Emo has these tags, because a Male Animal was needed in that slot when the game was designed initially and the DPS tag made very much sense, once the mission tags came in. That this turned into a werewolf is just happenstance, it could have been something or someone else entirely. If you want to go with the myth: Emo is experiencing a full blue moon all the time or has experienced the full moon for so long, he doesn't remember his human side anymore.

Now, your last idea adds even more complexity to the game design while not really adding any benefits as far as I am concerned. Dynamically changing tags based on an event or challenge makes developing the setup of the crusaders extremely challenging. What happens in case Emo is on a mission when things change? What happens to his Lone Wolf ability when he changes to humans? The way, data is stored for this game, the tags are static, set once and read everytime calculations or boolean requests are done.