Blueberry. Somehow I'm the first to say it in the comments.

MegaMan

Blue screen

Waffles

Gonzo

Blue ink. Blue paper. Blue crystals. Blue legos. All things that are definitely blue. Can’t be any other color, cause they’re blue.

A blue elephant

I'm

Did someone say sky yet? Because sky is blue (sometimes)

The sea.

Cobalt, and blueberries until you squash them, then they're purple.

Edit: Oh great, I was wrong about cobalt, but https://en.m.wikipedia.org/wiki/Cobalt_blue

Mrs. Peacock token for Cluedo

The blue pixels in my phone making that meme.

Shit why can't I think of anything blue

Alright, I hereby name my keyboard Blue. It's called blue now. It isn't blue, but I named it Blue.

Tobias Fünke

I named my bath towel Carl

sonic

those blue shark gummies at like trader joes

Blrule

Ocean

my blood while giving a transfusion

My car

kid named blue

Blue paint

Blue Jays

Blueberry

Persona 3

The Sky

listen up here's a story About a little guy That lives in a blue world And all day and all night And everything he sees is just blue Like him inside and outside Blue his house With a blue little window And a blue corvette And everything is blue for him

Scott the Woz border

Gibson Les Paul in Chicago Blue

My boy Joeseph Palasky

À blue pen ball

My cat. Just now. He’s not responding to it yet, but it’s only a matter of time before Blue wants something bad enough

Can't believe no one said "this post" yet

Huitzilopochtli

Blåhaj

Grass

my blue backpack