Melony is a character from SMG4, debuting in late 2019 with the episode Mario Alone (link in the description).

In the early episodes, she was just a literal normal watermelon wearing Meggy Spletzer's old goggles, beanie and headphones, who is somehow sentient despite not having a face or mouth. Is kinda hard to describe.. In the Youtube Arc, she was hired by long-time antagonist SMG3 as part of his gang to stop his old arc-nemesis SMG4 and his team, it failed. She later joins the SMG4 gang, and eventually gains a human form in Mario's Mask of Madness via the Fierce Deity Mask from Majora's Mask (again, link is in the description), as well as a voice dubbed by Wolfychu in later seasons.

She can't control her powers at first, but since of the sequence of events happened (which i won't go into because of spoiler reasons), she is able to not just controlling the infamous mask, but her mental age is aged up from 5 to 18. That's the basics on who she is, so now let's move on to her moveset.

Left or Right + CPunch or DKick

Swings her sword three times while dragging her opponent with it before throwing forward.

Right + BKick

Hops forward to attack the opponent with her rear

Right + CPunch

A headbutt attack.

Down + CPunch while in the air

Spins once with her arms stretched out.

Right + CPunch while in the air

Brings her sword down, knocking the opponent down.

QCF + Punch

It does exactly what it is, its a forward moving push with both hands. Heavy version knocks the opponent forward, and the EX version gives the move wallbounce properties.

HCF + Kick

Performs a brief "Naruto run" before delivering a swing kick, launching the opponent in the air. The EX version makes her fall to the ground, like she was tripped by a banana peel. Press Kick again to make her do a jumping arc kick after tripping.

Dp + Punch

Performs a horizontal jump as she flaps her arms like wings multiple times, dealing multiple hits. Its range varies depending on the button. The EX version makes her performing two Fruity Wings, one light, then heavy.

HCB + Punch while close

Command grab. Grabs her opponent with one arm. If done, she will wrap them around with wires and gets into her laptop to hack the system, then presses the enter keyboard to make the wires explode.

QCB + Kick

Spins forward with her leg stretched out. The EX version deals 4 hits. Melony has two followups:  If Punch is pressed, she will do Belly Slide, which exactly what it does, she slides along the ground with her whole body. If Kick is pressed, she does the Melon-Fu Kick, which is an upward jumping kick.

Charge Back, then Forward + Punch

A dashing lunge of her sword. The EX version has larger reach and knocks the opponent into a wall.

QCB x2 + Kick

Melony falls asleep, restoring her health at 35%. Before that, the opponent will be instantly hit when close to her, as indicated by a ping sound, knocking them super high in the air before crashing down, waking Melony up.

QCB x2 + Punch

Swings her sword to fire a 6-hitting beam forward.

QCF x2 + Punch

Picks up her sword and performs an upward sword slash, then does it again, this time by jumping. The latter deals 9-hits. Sort of like Haohmaru's Ougi Kogetsu Zan.

QCB x2 + Punch x2

Briefly turns into her Fierce Deity form and swings her sword to fire 6 beams, ending with a 6-hitting one.

QCF x2 + Punch x2

Picks up her sword and performs an upward sword slash, then a jumping one that deals 13 hits before ending with a downward strike.

Charge Back, then Forward and Back, then Forward + Punch

(normal imput)

Back, Forward, Back, Forward, Back, QCF + Punch x2

(KOF 2002 input)

Picks up her sword and and began to run towards the opponent using a battō technique to deliver a high speed slash, making the opponent crumble after a blood effect is spawn while in her Fierce Deity form.