Ratatar/Saurat
This concept/idea is based on the semi-cracky Mr Mouse/Silverpaw AU that me and some other ppl in the TROP fandom cooked up; basically, what if Mr Mouse was a smith like Celebrimbor (called Silverpaw) and had to deal with his own (tinier) forge adventures - wanting to live up to the legacy of his ancestor Firemouse and his many, many uncles, exploring the kind elven smith's forge, aaand being approached by a stranger with an unusual task.
A stranger who is definitely also a mouse and not a rat. The fact that he's hiding his tail is pure coincidence. Also, the other mice starting behave weirdly around Silverpaw is mere coincidence as well. Uh-huh.
Please go ahead and blame especially me, @thephoenixandthecrocodile (this awesome fanart in particular) @illegalcerebral, but also @verecunda for this one. For those who are interested, you can check out this post with more info on the AU and this (very long) post with various ideas and the aforementioned awesome fanart.
(screenshot via cap-that.com)