Yeah

Yeah, also known as Mr. Fabricate, is one of the three titular protagonists of the  series. He is the first member of a trio of Grins who, along with Jam and Fury, share the same body and must work together to get the delicious mango at the end of every level.

Character description
Yeah is a Grin clad in yellow accents, a color that reflects his bright and upbeat personality. His most notable physical trait is the presence of a mouth, which is usually grinning to resemble that of the Yellow Blocks he creates. Similarly to Fury, he wears a round beige hat with two brown earphones. There are two protruding antennae on the front of the hat's brim that end on yellow bulb-like orbs, though the purpose of his antennae has never been clarified. He wears a yellow shirt and a beige jacket with a yellow line, and he is mainly seen with his hands cuffed inside his jacket pockets most of the time he is not placing blocks. He also wears brown pants and two caramel shoes.

In Yeah Jam Fury: U, Me, Everybody!, Yeah finds out he can use a notebook he names the Memory Book to communicate with Jam and Fury without having to do so face-to-face. Yeah writes in yellow ink and has the neatest handwriting of the three. Like the other Grins, Yeah is obsessed with mangos for reasons he is unclear of, and it is implied he was given this obsession at a young age by Mr. Super. From what he writes, Yeah is the most eager of the three, excited by the prospects of reaching mangos and meeting Jam and Fury face-to-face, as well as learning new things. He is far more curious than Jam or Fury and seeks answers to mysteries such as his origins, his purpose, and his obsession. However, he becomes frustrated at the lack of answers over time, and he faces loneliness from not being able to meet other Grins. This eventually leads him to an existential crisis, though he is kept sane by his friendship with Jam and Fury and their determination to find the answers they want.

In the Yeah Jam Fury series
Yeah is the first of the three playable characters, along with Jam and Fury, in both games of the Yeah Jam Fury series. Compared to the other two, Yeah's walking speed is rather slow but he has the highest jump height of the trio. He is also very light, which slows his descent as he falls, allowing for more precise "footings".

Yeah's special ability allows him to create Yellow Blocks, which allow him and the others to cross abysses or reach higher areas. Normally, these Yellow Blocks can be placed almost anywhere using a cursor, as long as Yeah's shot isn't blocked. In Yeah Jam Fury: U, Me, Everybody!, Yeah has the additional ability to place a Yellow Block directly below him using a technique called the Quick Block. The number of blocks he can place down is limited to a quota containing any blocks given to him at the start of the level, along with any Yellow Blocks destroyed by Fury.

Trivia

 * Yeah makes a cameo appearance in the platforming game Mago by Dream Potion Games, in which he occasionally appears as a resident of Musicalia.