Here's why:
* He's mainly a spirit: Tom Riddle's presence is mostly felt through his diary, which is a playable object in the games. You can interact with the diary and experience some of his memories.
* The games focus on younger characters: The Lego Harry Potter games primarily focus on the events of the books and movies, and Tom Riddle is a more prominent character in later books.
* He's Voldemort later: In the games, you play as Lord Voldemort in his younger days. The games don't directly depict his adult form.
However, you can still encounter Tom Riddle in the following ways:
* His diary: You can find and interact with his diary in "Lego Harry Potter: Years 1-4" and "Lego Harry Potter: Years 5-7".
* Memories: You can play through Tom Riddle's memories as a child, revealing his early life and the development of his dark nature.
* His younger form: You can play as Tom Riddle in his younger form in the "Lego Harry Potter: Years 1-4" game, particularly during the Chamber of Secrets storyline.
So, while he doesn't appear as a physical character in the Lego games, you can still experience his influence and story through various interactions.