Masks and champion design
Earlier in League history, these two charts appeared to point at boring champion design: The male and female body type charts.
I've recently been noticing a similar trend with the way humanoid champions of each gender are presented.
We already know that the male monster champions heavily outnumber the female monsters. So let's consider the humanoids only.
Male human (humanoid) champs (counting yordles because there are about as many female ones):

Female humanoid champs:
(Wolf is just a glorified particle effect imo)

Now, which of these are masked?
Masked men:
(it's sort of his face, we're not certain?)
Headgear or things obscuring most of their faces: 

Masked women:

Covering headgear:

Which of the masked men have skins that unmask them?
, two of those do not count completely.
Which of the masked women have skins which unmask them?
.
If I were very much into social issues, I would say that this is because male champs are for self-insertion and female champs are for waifu.
But I'm not. I'm just really into Jhin and Azir and am dying for an unmasked Jhin and a pre-ascension Azir. I wish Malz, Zed and Shen would drop the hijab too tbh.
EDIT: Feel free to correct me by the way, this all is off the top of my head.