Hi Guys,
I also have a werebear type character they are awesome.
However i didn't really like silver as a catch (as most were-creatures are not loup garo types), in the end we had a couple of options, with a Norse feal we and anywhere cold we had fire, as it also something that bears fear... For a demonic grizzly we had holy objects. But for the final version we had a Native American type background and feel for where the power came from and the resulting catch was Obsidian, a substence that was made for only the best weapons due to the fact it is razor sharp (can be made sharper than steel) and still used for surgical blades today.......
Also as a feet wet character, the initial character did not have echos of the beast or beast change, reflecting he did not know how to use his power or his new form, after a few milestones he has begun to expand and use his powers and new form more readily...
Anyway hopefully this may help someone else....