- Homunculus
- Honest Protagonist
- Hospital
- Hot-blooded Protagonist
- Human Experimentation
- Human Weapon
- Human-Nonhuman Relationship (1)
- Humanoid Protagonist
- Hunters
- Hypnotism
- Identity Crisis
- Imaginary Friend
- Immortals
- Imperial Harem
- Incest
- Incubus
- Indecisive Protagonist
- Industrialization
- Inferiority Complex
- Inheritance
- Inscriptions
- Insects
- Interconnected Storylines
- Interdimensional Travel (2)
- Introverted Protagonist
- Investigations
- Invisibility
- Jack of All Trades (1)
- Jealousy
- Jiangshi
- Jobless Class
- JSDF
- Kidnappings
- Kind Love Interests
- Kingdom Building
- Kingdoms
- Knights
- Kuudere
- Lack of Common Sense
- Language Barrier
- Late Romance
- Lawyers
- Lazy Protagonist
- Leadership (1)
- Legendary Artifacts
- Legends
- Level System
- Library
- Limited Lifespan
- Living Abroad
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