Who created which characters?

[neatoman]

So something that bugs me a bit about TMNT, is that I don't know who created which characters. We all know that most of the central characters are created by Peter and Kevin with some help from Jim, Ryan and Steve, but other than that it's hard to tell.

A lot of this comes from the fact that many of the TMNT characters were created for a toyline of which I don't know how to track down who the designers of which toys were. Another problem is that a lot of others were created for TV shows and it can be a little difficult to tell when the characters were intended to show up, if they were a collaboration early on with a lot of planneing or just some character created by a writer for a single episode who wound up in more episodes than intended.

To some people this won't matter at all but to me it's kind of important to who the creator of a character is.

So who knows to whom I should credit some fuzzier character creation to?