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You have it in Foil and Duo Tropes
As an overlapping but distinct phenomenon, you often have the bulk of character dynamics shifted to deuteragonist characters when you have a high degree of Player and Protagonist Integration. Say, the game presents the two contrasting characters as the Right Way/Wrong Way Pair of a Freudian Trio, with the player character placed as the Ego between them.
Edited by Scorpion451

When the first two members of an rpg party are (usually) a guy and a girl that tend to bicker a lot or are otherwise foils to each other. Think Koops and Goombella from TTYD, Hiruko and Takemaru from Hundred Line, Junpei and Yukari from Persona 3, Yosuke and Chie from Persona 4, Ryuji and Ann from Persona 5, Kaiden and Ashley from Mass Effect, or Miranda and Jacob from Mass Effect 2. This could also apply to characters in other media who tend to be focused on first in the story aside from the main character like Jax and Ragatha from Digital Circus, Sayaka and Leon from Danganronpa or Eva and Wolfgang from Eden's Garden. For this trope to take place the characters should NOT be the main character nor should they be explicitly romantic.