So, I'm kinda new at Kirby. What's this dark blue thing?

Friend

gooey

As others have said, is Gooey, is friend.

Lorewise he's made up of the same stuff as Dark Matter one of the big villians, but the power of friendship means he's friend.

Mechanics wise, he's player 2. If you don't have a real player 2, he'll be controlled by a basic CPU that mostly copies what you do.

I've heard there's also some cheese you can do by spawning him when you only have one health (negating the one health cost to spawn him) and then eating him to restore up to two health, but imo Dreamland 3 is better without cheesing it.

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Unasked for advice: In Dreamland 3, the game that screenshot is from, every level (except boss fights) have some sort of puzzle in the level you can complete to get a "heartstar" from whatever character is standing on the last screen of the level. You unlock the true final boss by collecting all the heartstars and beating each worlds boss while you have all of them for that world.

As is Kirby tradition, the true final boss is horrifying.

I think it's a crossover event with 2008 Wii game de Blob

::: spoiler Spoiler It's Gooey :::

Fren is shadow. Gooey ain't no oopy goopy.

I loved that game, art style is beautiful.

Dark Matter defector

DID YOU JUST CALL ME BLOOOOOB??

Looks like Grover. (Muppet)