Oh, this takes me back! While there isn't an official novel solely focused on Goku's story, the 'Dragon Ball' universe has expanded through spin-offs and guidebooks. For instance, 'Dragon Ball: That Time I Got Reincarnated as Yamcha' is a fun side story, though it's more about Yamcha's bizarre adventure. The 'Dragon Ball Super' manga and anime fill in gaps post-'Z', but if you're craving a deep dive into Goku's psyche, you might enjoy fanfics or the 'Dragon Ball Z: A Survivor’s Tale' novel, which explores lesser-known corners of the saga.
I’ve spent hours digging into supplementary material, like the 'Dragon Ball Forever' art books, which offer tidbits about Goku’s character development. Toriyama’s interviews sometimes feel like mini-novels themselves, revealing his thought process behind Goku’s growth. Honestly, the lack of a dedicated novel surprises me—someone should pitch this to Shueisha!