A 12 year old that doesn't interact with the world.
Many believe that AGI will happen in robots, and not in online services, simply because interacting with the environment might be a prerequisite for developing consciousness.
You mentioned boredom, which is interesting, as boredom may also be a trait of intelligence. An interesting question is if it will want to live at all. Humans have all these pleasure sensors and programming for staying alive and reproducing. The unburdened AGI in your description might not have good reasons to live. Marvin, the depressed robot, might become real.