The Latin word for 'graphic novel' could be 'liber graphicus' (though this is a bit of a constructed term as there may not be a single, traditional Latin term precisely for 'graphic novel').
Well, to be honest, I'm not sure exactly what the equivalent of 'fiction' is in Latin. But usually, words like this have roots that suggest imagination or creation.
Well, in ancient Rome, the word 'novus' (the Latin word related to 'novel') was used quite broadly. In the realm of literature, when poets or storytellers were creating something that deviated from the norm, they could use 'novus' to convey that sense of newness. For instance, if a playwright was writing a play with a new type of plot structure or character development, 'novus' could be used to describe it. Outside of literature, in the political and social arena, 'novus' was used to talk about new policies, new leaders who brought new ideas, or new social classes emerging. It was a fundamental word in the Latin vocabulary for expressing the concept of newness, which is related to the modern concept of a 'novel' as a new form of literary work.