Now that we have Kai'sa...

I'd like "Giant Enemy" to be just a title for Urgot, just like Veigar has "Final Boss". However, I'd like it to be expanded into a larger skinline for undersea creatures. Not like Deep Terror/Deep Sea. More eldritch, in a sense. Let it really hit people with Thalassophobia hard. I wanna feel spooked by these guys.

Leviathan Enemy , as... well, a... Leviathan.

Eldritch Enemy , as a Cthulhu-like being, with tentacles instead of branches. The big boi of the group.

Kraken Enemy , as a Kraken.

Or, if Riot wanted to somewhat base it off of Runeterra...

Krakenwyrm

Eldritch

and of course

Nagakabouros

Easily could be 1350 skins, with an 1820 Maokai skin, as he is fairly prevalent in pro-play.