Rimuru Tempest is the central figure in the 'Resurrected as a Slime' light novel. He's the slime with unique powers. There's also Veldora, a powerful dragon who befriends Rimuru. Veldora is trapped in Rimuru's stomach for a while and their relationship is quite interesting. Then there's Gobta, a goblin who is often involved in comical situations. He's one of Rimuru's first followers and his growth throughout the story is also something to note.
The 'Resurrected as a Slime' light novel is known for its engaging plot. It has a great balance between action - packed sequences and slower, more character - driven moments. For example, Rimuru's encounters with powerful monsters and his efforts to improve his own strength are exciting. At the same time, his interactions with his subordinates and friends, like Shion and Benimaru, show his more human (or slime - like) side. And the novel also explores the concept of evolution, both in terms of Rimuru's own growth and the development of his kingdom.
Well, one obvious difference is the medium. Manga is visual, so you can directly see the slime's appearance, the expressions of characters, and the action scenes. For example, in a slime battle scene, the manga can show the slime's movements vividly. However, a light novel uses words to describe all these. It might describe the slime as a gooey, translucent blob that pulsates with a strange energy.
Well, without more context, it's difficult to say exactly. 'Slime' in light novels often refers to a type of creature, which can have various forms and abilities. The '300' might be a volume number, a chapter number, or something else entirely. It could be a story where the slime is the protagonist and there are 300 important elements in the plot, like 300 quests it has to complete or 300 different types of magic it encounters.