It's a Zelda/Pokémon crossover drawing by gentleghosts. I assume it's an original design.
https://www.reddit.com/r/zelda/comments/10xfmg1/ootoc_youngster_link_and_eponyta_want_to_fight/
I think it's Anjali from Dungeon Siege III in her Archon form (https://dungeonsiege.fandom.com/wiki/Anjali)
Full image: https://x.com/Obsidian/status/951171255964549121/photo/1
Yep, that's Plutia from Hyperdimension Neptunia. I'm pretty sure that's official art. At any rate, Miky has already taken care of providing a source. ^^
That's Yayo, from Puchimas! Petit Idolmaster. :)
It looks like that's an anime screencap. There's a Nicovideo upload of this bit, specifically. https://www.nicovideo.jp/watch/sm18958807
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