Credits: 

Improved Meta Knight Sprites + Music Additions - SphericalCube
Disabling the Vampire Killer's Whip Dangle Code - DevAnj
Better Superjump for Julius - Masked Dedede
DSVania Editor - LagoLunatic
The Hack itself - Oersted

The Jist of this!
Play as Meta Knight, from Kirby Super Star Ultra, in this Julius Mode hack. All Content from the original game is pre-unlocked, allowing Julius (Meta Knight) Mode to be played immediately. 

This hack was made in around 25 Hours, and features a fully Customized Playable Character, Skills, Voicelines, Music, Hitboxes, and animations.

New Skills
Gordo EX
Acts like the Needles summon.

Flight Mode
Meta Knight flies.

Up-Thrust
A Stab upwards with an amazing hitbox.

Spear Throw
A simple spear is thrown while Meta Knight does his slash, useful for hitting multiple times very quickly.

Version 1.0.2 Changes
Meta Upper was replaced with Flight Mode.
Meta Knight's hitboxes were all improved, and no longer takes damage early from Flame Pillars.
Gordo was changed to Gordo EX, with a larger hitbox and more power.
Tons of new music, implemented by SphericalCube.
Meta Knight's Defense and Constitution were increased by 3.
Up-Thrust can now be used in the air.
Up-Thrust's hitboxes were made bigger.
Spear Throw's MP Cost was increased.
A new game over screen was implemented.