For what it's worth - I think he's just an Unix-type geek that lurks everywhere. It's an older school of IRC user, and being creeped out might just be an overreaction. He's not done anything particularly offensive that I can see, and I've even had the odd conversation with him.
He seems pretty harmless to me.
I've been monitoring talib's usage and couldn't see that he'd done anything wrong, nor has anyone made complaints about him. He seems generally polite and hospitable towards other users.
Everyone needs to be aware that the chan is public. Do not share private information there unless you're happy for (potentially) anyone to see it. It's as simple as that.