A slightly unusual take on Alexander Goth
For a long time, I considered Alexander Goth to be one of the least interesting Sims in Pleasantview. After all, he's this kid who's supposed to become a Knowledge Sim and all that. Well, that's one interpretation. However, if you dig a little deeper, it turns out that Sim memories, as well as the Goth family album, suggest that he was supposed to be born around the same time as the Pleasant twins, if not earlier. If he's a peer of Angela, Lilith, Dustin, and Dirk rather than Lucy or (to a lesser extent) Beau, this changes his social dynamics, of course. He also has a hidden Fortune token, not Knowledge, which may hint that this is what the game developers intended.
So, my headcanon of him is that, at the start of the game, he's about the same age as Angela, Lilith, Dustin, and Dirk. He's also a Fortune Sim, with Knowledge as his secondary aspiration. Cassandra is perfectly content with having a family and doesn't really care about the Goth legacy, so Alexander is the one who feels obligated to continue it (though Mortimer doesn't pressure him to do so). His Fortune aspiration reflects his desire to excel in his chosen field (which could be some scientific endeavour), because that's what a Goth should do, not necessarily because he's obsessed with earning and having money.