As hurnerjsger_ said, no. Probably not. This would make for some weird new skin shapes, so for Minecraft servers it would impact PvP (and a lot of other game-modes), and you'd have to hit on the perfect spot, instead of hitting on blocks; which is arguably better than weird shapes and sizes. It could also straight up be an unfair advantage to other players.
The only way I could see this working is this: In the console editions of Minecraft, in Battle Mini games, people can choose to be a Yoda skin, or anything small like that; so you can zoom around other players feet, giving yourself an unfair advantage for the normal-sized player. But, good thing is, you can turn off the ability for players to have skins like that, that make you smaller and harder to hit. If Character Creator was added into Minecraft Java, it would somewhat work out if servers had the ability for that.
However, still seems inconvenient and I don't think it'll be added. But, there's always a chance! - I mean, I don't work at Mojang. How would I know? >.>
Rollback Post to RevisionRollBack
I am most active on Discussion, but you'll see my messages all around the place since threads get moved a lot.