congrats, I love the deer branch! That's a great one to have. If you successfully evolve to stage 2 you unlock a really nice scene. Also as a random note, if you don't like the deer necessarily, you can also post in the Ryu Trading thread to see if anyone wants to trade you a different Ryu for your deer ^^
edit - this unlocked the Spongebob pop for me and I didn't even know it was a thing I'M DYING
EDIT 2 - oh yeah! And while there isn't an official yoda Ryu, @(you need an account to see links) did make @(you need an account to see links) a super cute custom one in her thread here - (you need an account to see links)
custom Ryus can't replace the official ones in the actual userbar but they can be added to an avatar image, like my little sea serpent that GWN also made for me