I think the only reason derplander isn't in a TT card himself is because he's only used in promotional material and never in the actual game.

Please don't misunderstand, it's a good idea! However, from the perspective of your character, the scions, or anyone else. They'll say: "Who tf is this derplander fella?"

Although an excuse to pull it out would be something like: "We asked an artist to create a TT card for you, but it seems for some reason they got the wrong picture for you" or something along those lines.