Fern (Adventure Time)

Adventure Time · Series · Adventurer, Champion of the Candy Kingdom

Fern

Tier: 5-A
Attack Potency: Large Planet Level
Speed: Ftl+
Durability: Large Planet Level

Grass Knight

Tier: 5-A
Attack Potency: Large Planet Level
Speed: Ftl+
Durability: Large Planet Level

Powers and abilities

Superhuman Physical Characteristics
Sword Master
Martial Arts (Skilled H2H fighter)
Surface Scaling (Crawls on the walls of the treehouse and casually scales towers without any rocks or bricks to climb. Can hang off of icicles in the Ice Kingdom)
Acrobatics (Hypermobility, Self-Momentum, and Surface Running; Parkours throughout the City of Thieves. Capable of doing triple flips out of his house and over people. Can do flips from one handed hand-stands and does large backflips across fields alongside Fern. Does several flips off of the Jigglers' noodly arms. Can run up vertical surfaces with enough speed)
Master Swordsman (Trained by Rattleballs)
Non-Physical Interaction (Is one with the Grass Sword, which killed the manifestation of Finn's fear. Finn was able to make contact with, fight, and kill Gladiator Ghosts. Can make contact with Wendy, Booboo, and Georgy)
Weapon Creation
Size Manipulation
Inorganic Physiology (Is made out of grass)
Limited Water and Light Manipulation (Uses Water and Light to create his own food via photosynthesis, since he can't eat)
Self-Sustenance (Type 1; Doesn't need to breathe)
Body Control (Can grow and stretch his arms)
Statistics Amplification (His strength increases with his increased size)
Transformation (Limited)
Plant Manipulation (Limited to himself)
Regeneration (Low-Mid. Can regrow limbs)
Statistics Amplification (Can grow into a larger arm that can assist Fern in lifting, striking, and more)
Non-Physical Interaction
Telepathy (Telepathically speaks to the Ancient Psychic Tandem War Elephant)
Sound Manipulation
Portal Creation and BFR (Can make a portal to the Nightosphere, and can create it under people to force them there)
Memory Manipulation (For memories that Fern cannot handle, he can lock them inside of his mental vault)
Imagination Powers provide Finn and Fern with Reality Warping
Teleportation
Life Manipulation
Limited Mind Manipulation
Pocket Reality Manipulation
Biological Manipulation
Telekinesis
and Probability Manipulation. Resistance to Mind Manipulation and Perception Manipulation
Acid Manipulation and Electricity Manipulation
Sleep Manipulation
Minor Transmutation
Cold Manipulation
Soul Manipulation

Weaknesses

Fern has a tendency to go "too far" in his battles, which can leave others seriously injured. Heavily implied to still be under the effects of the Grass Curse, which appears to effect his thought process in major ways. If the Grass Demon possessing him is killed he will begin to slowly disintegrate, as he doesn't have a body without the demon.

Ranked tied for #9 of 43 in Adventure Time by strength.

Close fights from other series

Fern (Adventure Time) vs Ladybug (Miraculous · Tier HIGH 5-A): Fern · Slight edge
Fern (Adventure Time) vs Champion (Terraria · Tier HIGH 5-A): Fern · Favored
Fern (Adventure Time) vs Monster X (IDW) (Godzilla · Tier 5-A): Monster X · Slight edge
Fern (Adventure Time) vs Zauriel (DC · Tier 5-A): Zauriel · Slight edge
Fern (Adventure Time) vs Zero (Kirby) (Kirby · Tier 5-A): Zero · Slight edge
Fern (Adventure Time) vs Cui (Dragon Ball · Tier 5-A): Too close to call
Fern (Adventure Time) vs Erza Scarlet (X793) (Fairy Tail · Tier 5-A): Too close to call
Fern (Adventure Time) vs Arc-Gurren Lagann (Tengen Toppa Gurren Lagann · Tier 5-A): Fern · Slight edge

Compare Fern (Adventure Time) with another character · Fern (Adventure Time) on the VS Battles Wiki