Hey Draygen,
While it technically hasn't been too long since his last skin (STK, I know, I know, it's legacy), it hasn't been as long as other champions have been waiting, such as Zac (yay, he finally has skins!)
When we create skins, we have several main goals, depending on what we're looking to do with a skin.
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The first is obviously to create an awesome skin.
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To create a thematic of skins (Marauder/Warden). In a case like this, we're looking for champions that could fill that thematic space. (This also applied to events such as Harrowing, Lunar Revel, etc).
One thing to note here is that if we have a skin planned for a holiday, you likely wouldn't see a skin for x champion until then. Let's say we made a Harrowing skin for Zed; you wouldn't see a skin for him until October, but the skin would be appropriately placed due to thematic.
- To create a skin for a champion who hasn't had a skin in a long time (aaaand isn't on the list of reworks - like Taric).
Chromas don't mean that champion is out of the running for a skin for another two years. As you've seen with Zac, a champion can get chromas and a skin at the same time.
I like your ideas for Zed skins - they take up different fantasies that his base doesn't fulfill, and that's the goal of a skin. :]