He has cyan eyes and slicked back yellow hair.
Along with Study-kun B, he exists for the purpose of testing the Matchmaking elimination method. These students are intended to mimic the conditions that will be present in the final game, in which there will be enough students at school for the player to reliably determine what their rival is attracted to.
If the player gets Kokona Haruka to follow them around the school and bring her past Study-kun A, she will blush, showing that she is attracted to a trait he possesses. Through the process of elimination, the player can discover that the trait Kokona is attracted to is slicked-back hair.
The player is unable to interact with Study-kun A, and Info-chan does not recognize pictures of his face.