If you want to keep your characters consistent, you need to understand who they are, and how their various personality types will clash or mesh with the other characters'. Snake being very, very different from the mane six, plotting out how their characters would interact and getting it down on paper (so to speak) is a very, very good idea.
So I wrote this out to consult, and decided to post it publicly, rather than hoard it to myself. You're welcome.
Solid Snake and...