Imaginings of various legendary figures

What? No Rabbit of Caerbannog?

Shame.

Did this artist have access to a larger range of colors for skin tone than lilly white to first days of summer light tan?

I mean, I guess they gave Mulan jaundice and Gilgamesh a slight bronzing..... But the guy must have never met an actual Greek person in their life.

first days of Sumer
Gilgamesh
bronzing
Sounds fair.
It could be worse, imagine if they drew Gilgamesh as a blonde red-eyed twink who gets his ass kicked by a Japanese highschooler
ikr and their faces look like they could all be siblings.

Various eurocentric legendary figures. Hasn't played dynasty warriors have they.

D'Artagnan was a real person though.

So we're many of these.

Why does Beowulf have a sword?

Presumably because he used a sword in the fight against Grendel's mother and the dragon. Though, when I think of Beowulf, I think of Grendel first and foremost, so depicting him as unarmed makes sense.

Ragnar doesn't appear to have hairy breeches. Points deducted.

Why does king Arthur use a roman helmet?

There are theories that King Arthur is based on a leader of a left-behind or stayed-behind regiment of Romano-british soldiers based out of what is now Wales in the 4th and 5th century.
The regiment in question would have been Dacian cavalry, known to ride into battle with a dragon like battle standard called a draco.
Anyway, the historicity of this is doubtful, but that's why he's often shown with Roman armor etc.
- It's considered plausible because there are texts from the 9th and 10th c. that suggest that the people in Wales and Cornwall did know of someone named Arthur who was good at fighting and leading men. Then the entire legend came after Monmouth picked up that name from some tales, and used him to claim a connection between him and the Normans to legitimize the Norman rule over the Saxons. It wouldn't have made sense to do that if people didn't already know who Arthur was and already thought there was beef with the Saxons. As in, "remember this Arthur guy that you like and who didn't like the Saxons? Well, the Normans are just like him." Everything else in the legend was copied from older cycles and boosted with the crusades and the growing romance period - and we don't know what tales Monmouth used as basis (or claimed to use), to the point he might only have had the name and made up the rest too. But the fame has to have existed before.
  Once you have that, someone Roman-related is the only spot that fits with everything else we do know. The Dacian cavalry is not necessary though, we know that "Arthur's court"' was literally filled with Celtic, Irish, Welsh etc. mythical figures from the beginning, as well as contemporary real people who didn't belong to any Arthur.

Basil? Basil the Bulgar-slayer? Fictional caracter?

Legendary doesn't necessarily mean purely fictional