Well, most of the things in the game is presented with silliness, and the line to being a joke is in the definition, so with me, and you. Your example of Bella Goth is quite good, because the game is not overridden with her, it's just a premade household, and there is a book I think, called Where is Bella (or perhaps that was in TS3); but her presence is not forced upon the player, and premades can be ignored.
The llama theme is milked, and too present in the game, and if the joke is not understood or thought to be funny in the first place, it is just a llama figuring on build items I would rather not have a silly animal head on, for example. To me, not actually being a fan of the series just a player, there is no need for an icon, and focusing too much on supposed legacy makes the legacy thin indeed, if it is to be just this. I am sorry if you are upset by my opinion though!