Well, for those wondering how to get Yarizo in your party, the simple answer is: You can't, at least not right now, it may be coded and people managed to cheat it to happen or is a patreon exclusive or whathever but there is no dialog option to ask him to join.
When you enter the docks you get the options of helping Yarizo or ignore the situation (if you are evil alignment).
Then you can either kick the thugs's ass (requires Strenght), tell them that you'll pay whatever Yarizo owns them (-100 gold), or straight up kill them (needs 10+ Insanity).
After that the only thing that happens is that Yarizo introduces himself, MC and Priestess see his dick because his pants are torn, he goes to get new ones and the last options are just some dialog options about what just happened. 2 funny ones are second one where MC tells Priestess that's a lvl99 dick and last one he ask Priestess if she liked that dick.
Ver.25 ends when you talk to the knight and the elf, and beach has the other 2 new scenes so unless Yarizo is hiding somewhere in the other areas of the game I believe him joining is for a future version.