Hit from Dragon Ball Super is playable in Dragon Ball Xenoverse 2, but you have to unlock him first. Here’s how you can attain him as a playable character.
Bandai Namco Europe actually posted how you can get Hit in Dragon Ball Xenoverse 2 via Twitter. They said: “You can get Hit by making a wish with the Dragon Balls ;) Good luck!”
In order to get Dragon Balls, you have to complete parallel quests they said. You may have to do many parallel quests in order to find all seven of the Dragon Balls.
According to YouTube user, MrGiveYourGirlBack, parallel quest number 4 is the easiest way you can get Dragon Balls in the game. Once you get all seven of them, you can make your wish.
In order to summon Shenron, you want to move to the center of the map. Just fly there and go to a location that says “Dragon Ball Pedestal”. An animation will follow with Shenron summoned.
After that, you have several options. In order to make Hit playable, you want to choose the option that says “I want more usable characters” After you choose that option, Hit from Dragon Ball Super should now be playable for you in Dragon Ball Xenoverse 2.