There's also "Spin the Bottle" where the teenaged Liam isn't, I think, nearly so remarkable. In terms of the relationship with his dad, you see him pointing out both being disapproved by his father (and hurt by it) while also aware of his father's own hypocrises.

Liam, the human, seemed like a very frustrated person to me. The way he relates with Faith... while I think the drinking and carousing was probably fun for him, I don't think it ever made him happy. He could have worked better to make himself more fulfilled (we do eventually see that on other shows) but he was perhaps too melancholy of dispostion to do that on his own without feeling a tug from someone else first.