To quote wikipedia

"Intelligence has been defined in many different ways including as one's capacity for logic, understanding, self-awareness, learning, emotional knowledge, reasoning, planning, creativity, and problem solving. It can be more generally described as the ability or inclination to perceive or deduce information, and to retain it as knowledge to be applied towards adaptive behaviors within an environment or context"

Though there are some instances where most characters can surpass the limits of omniscience in ridiculous degree that it could just boggle your mind. Same goes for downplayed characters having the intelligence of a turd or even lower

Here are some possible scalings for this wiki

  • Dumbass: Characters having the intelligence of a turd or lower
  • Learning Impaired
  • Below Average
  • Average
  • Above Average: Characters that show greater cognitive ability than the norm, but do not particularly stand out in any intellectual or academic fields.
  • Gifted: Character that demonstrate high reasoning ability, can master concepts with few repetitions, and display high performance capability in intellectual, creative, or specific academic fields.
  • Genius: Genius level intelligence in one, or a few, areas of research.
  • Extraordinary Genius: Far above real world human intelligence in multiple fields of research. Capable of inventing futuristic technology.
  • Supergenius: Vastly superhuman intelligence in virtually all fields of research.
  • Nigh-Omniscient
  • Omniscient
  • Beyond Omniscient: Intelligence being ridiculously above the likes of omniscience. It is usually saved for beyond tier characters.