[quote=@Ejected]
Alright, so I was originally planning to create Tiana from The Princess and the Frog. What I didn't realize, however, is that she is already in the TV series in season seven, which I have yet to watch. Would I have to make the same character and have the same story line as it is in the show, or can I make her my own?
[/quote]

You can have a character that is on the show. You can choose to use the same story or you can make that character all your own. If you make her your own make sure to think about how she might interweave with the other characters.

[quote=@Keyblade87]
Would Lion King characters be plausible?
[/quote]

Sure they just have to have human form.