Power Couple ™
I think I have a clear idea about how the cartoons are formed properly. It depends on the desire of the person being used. If Boris is Wally and what we've heard about Wally is true, it would make sense if he were perfect because he would love to be part of the show and be one with a character he loved. Susie on the other hand chose to become Alice out of fear of keeping her role and selfishness, making her imperfect. Sammy was entirely unwilling, resulting in half-formed ink humanoid.