A few weeks ago, I began a new campaign with some newer players, and for the most part they have jumped right in. They may need some strategy work, but they do fine (partially due to me sending them monsters with equally bad tactics.) One of my players, however, doesn't quite seem to take the game seriously or consider that their character's actions should be their own, rather than the actions of the person controlling them.
The player in question is a guy I'm gonna call Will for privacy purposes. Will had tried to play the edgiest character they could comprehend, a Vampiric Blood Hunter. I was able to talk him out of this, as I have no experience with both the race and class. So Will decided to play one of the most stereotypical CN rogues that I have ever seen. Now, this is not the main problem with Will's character. The major disruption to the table is Will's character attempting to seduce every single male character we encounter by failing charisma checks and generally ruining all of the party's social encounters with cheesy pickup lines and bizarre and/or explicit pop culture references. Whenever we go into combat, Will is almost always sleeping, and, if not asleep, makes no attempt to help their own party in any way. One example was when the party's camp was attacked by a band of dimwitted bandits, and Will's character stayed inside the wagon with his dog, instead of going outside to inspect the obvious sounds of fighting and screaming party members.
They have not actually complained directly to me, but there is generally a bunch of appeals to that player to "not do that." For example, when the player was hiding in the wagon for no reason, the other player characters were constantly yelling for that Will's character to come help, getting more and more annoyed, and there are generally groans all around when Will decides to attempt to seduce something.
I want Will to engage more constructively in the game, but it seems that he doesn't want to take the game seriously in the least, bursting into half hour fits of laughter in the middle of the game and talking about stuff that is completely out of context. I don't know what to do about it, but I don't want to kick Will as his sister and friends are in the group, and it may hurt his self-esteem.