First on the left, Hearts:
She is the embodiment of love, kindness, and naivete. Often in a psuedo-dissociative state, daydreaming. Loves Spades.

Next, Spades:
Smol and angry. Seriously. Angry. Except when he's with Hearts. Then he's nice.

Diamonds:
Very awkward person. Has a crush on Hearts, but is afraid of Spades. Very little ability in dealing with social social situations. Blind, uses the visor to 'see'. Cuddly, though. Spends his time coding, reading, and researching.

Clubs, far right:
Cool, collected. Slightly aloof. Tends to ignore people a lot. Spends twice as much time daydreaming as Hearts... Mostly because she's seeing something either from the past or coming up in the future. Her third eye just sees a heatmap of everything; she doesn't really use it. Is obsessed with the number three and doing things in threes.