Goopy appears to be a blue slime with a small red nose. In his final form, he has his blue face with an angry frown on a grey gravestone with a cross on top, displaying the term "RIP" (Rest In Peace).
Goopy acts incredibly narcissistic and overconfident in his boss fight, always commenting on how handsome he is, even as a gravestone as seen in his death screen. However, he seems to hold respect for his opponents, as he makes a cap-tipping gesture to Cuphead and Mugman before the fight is initiated.
"With a face like mine is it a crime to be bouncing all the time?"
—Goopy Le Grande, Phase 1 Death Screen
- Glop Hop - As the battle commences, Goopy Le Grande begins to bounce around the area in hope of crushing the player(s), which can be avoided by moving around or dashing out of the way. In Expert mode, Goopy bounces much faster.
- Blue Broozer - Occasionally, he will stop bouncing, give a little time for the player(s) to react and throw himself towards players to punch them, turning himself into a giant blue boxing glove after a short pause and yelling "PTOO!". The range of this punch is very short so the player(s) can dodge it by running away easily; as well as also crouching to avoid it safely while still shooting him. Goopy Le Grande will also automatically change directions depending on which direction the player(s) is (are).
After taking enough hits, he will eventually stop and swallow a pill. He then grows twice as large as his original form. He will spawn three pink question marks while he transforms, which is crucial to getting an A-Rank or an S -Rank as they are the only objects in this boss battle that can be parried and getting those ranks require you to parry at least 3 objects. Hitpoints = 440/288/336
"I'm a handsome slime bringing pain -- one bounce at a time!"
—Goopy Le Grande, Phase 2 Death Screen
In this phase, Goopy grows twice as large and gains some brown eyebrows. He now bounces more erratically and his slam covers more ground. He reuses his two previous attacks, but they are more powerful and harder to dodge to some extent:
- Out Of The Blue - Goopy will still bounce like he did in his first phase, but he takes more time doing it, thus giving you more time to escape. However, due to him being larger, there will be less room to. Also, they deal more damage.
- Slippery Slugger - He is now able to throw a punch using his own fist instead of throwing himself, and now, the range is longer. However, those punches are avoidable when the player is in either the far left or far right side, and if there is no way to escape, it's ideal to just duck/crouch and shoot at the same time.
After taking enough damage, he will stop bouncing, dazed, and is soon crushed by his own tombstone. However, in Simple difficulty, the tombstone doesn't crush him, and the battle simply ends with him dazed and defeated.
Hitpoints = 560/540/560
"I'm very smashing... even in grave situations!"
—Goopy Le Grande, Final Phase Death Screen
Even after being crushed, Goopy continues the battle as a tombstone.
- Grave Danger - His only attack is sliding from left to right, stopping only momentarily to slam down onto the player(s) in attempt to crush them (he doesn’t damage the player when sliding left and right). Goopy usually goes by the players 2-3 times before going for the slam. In Expert mode, his tombstone slides across faster, slams down faster, and is generally less predictable, sometimes slamming after just one passage.
The only way to damage him is by shooting at his face on the tombstone, which can be quite a hectic experience as players will both have to shoot at him and try to avoid being crushed by him. If the player has Super Art I unlocked, they can jump at the edge of the screen and activate it inwards, dealing great damage.
After taking enough damage, Goopy is defeated and his tombstone breaks in half as the picture of his face gets "X" eyes. Hitpoints = 372/504
|Goopy lunging to attack.|
|Goopy in the process of becoming more gigantic.|
|Giant Goopy bouncing.|
|Giant Goopy punching.|
|Goopy being crushed on his tombstone.|
|Goopy's tombstone taunting Cuphead and Mugman.|
|Goopy's tombstone after being ripped and cracked.|
|Regular Mode||Expert Mode|
- His design seems to reference the Slime, a common enemy and the mascot of Dragon Quest.
- The background seems to resemble those in Disney films such as Snow White and the Seven Dwarfs and Bambi.
- The way Goopy lunges in the form of a boxing glove in the first phase resembles an attack done by The Blob from ClayFighter.
- Some of Goopy's facial expressions in both his 1st and 2nd phases resemble Brom Bones' from the ComiColor Cartoon The Headless Horsemen. Likewise, his facial expression on his tombstone resembles those of the numerous animated tombstones in Swing You Sinners!, a 1930 Fleischer Studios cartoon that is referenced many times throughout the game.
- His theme has a motif from the Punch-Out!! soundtrack, specifically from Little Mac Down.
- There's also references to the game in concept art.
- He is basically the tutorial to get players well acquainted with the dashing and ducking features.
- His name, Goopy Le Grande, means Goopy The Great in Italian.
- "Le Grande" is also is Spanish for "The Big".
- In the first trailer from late 2013, there were two Goopy Le Grandes. This was changed in the final product because of difficulty.
- Early designs for the fight had a phase in which Goopy would duplicate themselves, requiring the players to dodge both of them, as they jumped around.
- Unlike most bosses, Goopy Le Grande doesn't appear in the good ending with all other debtors, which leads to the assumption that he was actually killed.
- He is also the second boss that doesn't appear in the good ending, with the first being The Root Pack, the third being Wally Warbles, and the fourth being Dr. Kahl's Robot. However, Wally Warbles and Goopy Le Grande have been confirmed by Designer Jake Clark to still be alive.
- He could also probably be hidden by bigger characters. (Ex: Captain Brineybeard can be in front of Goopy Le Grande, thus, completely hiding Goopy.)
- It may seem impossible, but the player actually can parry slap in this battle. However, the only things that can be parried are the three question marks above Goopy's head in his first transformation.
- Goopy Le Grande is the only boss in the game to never use any kind of projectile attack or minions to aid him.
- However, he was originally going to have 2 little minions in the third phase. These small versions of Goopy were later reused in Forest Follies.
- Goopy originally had Honeycomb Herald as his battle theme rather than Ruse Of An Ooze.
- The background used for the battle with Goopy in the demos was changed to an all-new background when the complete game was released.
- During the second phase transition, the tombstone isn’t animated until it lands and squishes Goopy.
- Goopy's old death phrase was: "You were slimed! I guess you should try harder.".
- His knockout animation appears to be a pun on the acronym commonly found on tombstones (including his own), "R.I.P.", which stands for "Rest In Peace", the knockout animation takes it literally and has the grave actually ripping in half.
- His "Grave Danger" attack may be a reference to the Whomp enemies in the ''Super Mario'' franchise.
- In the early beta versions, in Goopy Le Grande's intro, Goopy would be surprised when he and Cuphead make eye contact.
- In early gameplay, when Goopy Le Grande is defeated in his giant form, there is a smooth transition of him being knocked back with a painful expression and back to his dazed animation. It was scrapped in the final version, now when he is defeated in that form, it cuts to the dazed animation immediately.
- In the unused code of the game, Goopy's final phase has minions that would run around to disturb the player(s), they are the same entity existed in Forest Follies, and they will respawn every 3.4 seconds. They still flash red when hit so they are probably removed after the demo of E3 2016. In Expert mode, they will respawn every 3 seconds. Hitpoints = 3.9
- There is a bug when those are in a turning around animation and get killed during the animation, they will get stuck and the hitbox is removed.
- According to early sketches shown in an interview, Goopy Le Grande was originally going to be called "The Great Slime".
- In the early concepts of the game, Goopy would've been fought after the player exited through the tutorial door.