Looks good!  In terms of character ties, maybe he could be Magura's son?  Just the idea of Magura being a massive man and renowned hunter having this tiny son and everyone being like "ehhhh idk if he can be a hunter" and then him ALSO being really good seems cool.  Also that prankster, kind of cocky personality seems like something that would be appropriate for the son of a chieftain lol.  But only if you feel like that would fit with the character.  Either way, he's definitely approved.  

Edit:  That was directed at [@Potemking].  Looking over [@AjaxNightshade]'s now.

Edit2:  I also really like Kachiro!  As a side note, I feel like he definitely would have something made from the cougar's bone left over, maybe just a little skinning knife or something like that.  Sounds like it was a pretty special kill, so definitely something they would use the bones of in case they need to "borrow its strength" later on at some point. 

As for where to put it, you can probably just edit the form into one of your posts in the characters tab.