Novels where mc is somthing like a parasite, maybe the mc has a system of sorts. Also a long novel Thanks
Vainqueur the Dragon (on Royalroad) Already completed and extremely funny. It's the tale of a great red dragon and his human sidekick, Victor, as they discover the ins and outs of a system and ride it to great adventure and riches. But there are also great perils awaiting: taxes, gold-hating liches, End of the World agents, internal corruption, friendly & unfriendly betrayals, and armies of asshole monsters. I personally had a great time reading it. A Dragon Idol's Reincarnation Tale (on Royalroad) A girl who dreamed of becoming an idol on Earth (and busted her ass trying) tragically dies. But she may have the opportunity to do so in another world. Only she may have to overcome some difficulties, like survival on a deadly forest, church / noble conspiracies & politics in a magic world, intervention of gods, titanic monsters, old & quaint cultural differences, a demon invasion or two, etc. On the plus side, she is now a dragon. Bit hectic and has some issues at the beginning (parallel minds chapters), but improves massively over time. Specially once main character finds other people and much more when they leave the forest (best chapters are set after that, in my opinion). I'm eagerly awaiting some reunions and first meetings (grandpa god dragon).
Once Human, Now a Parasite I Leveled up from Being a Parasite, But I May Have Grown Too Much Re:Monster Goblin Kingdom
Apotheosis of a Demon – A Monster Evolution Story A very unique VRMMO story, it also has Kumo Desu ga-vibes.