"So 'Yuuki' — you put your own name in, huh." "Yeah, that's the basic for roleplaying games, isn't it."
Literal
'Yuuki' [quotative-って], as-expected self [gen-の] name put [explanation-んだ]. / Yes [よ], this [subject-が] roleplay [gen-の] basic is-[isn't-it-じゃん].
Gaming chat. やっぱ is the casual contraction of やっぱり ('as expected, after all'). ロープレ is the Japanese abbreviation of ロールプレイングゲーム (RPG, 'role-playing game'). じゃん is the casual contraction of じゃない (か), used for 'isn't it / right?' in youth speech. The exchange captures a gamer's confident assertion of RPG protagonist-naming as a genre convention.