Poor Jack. He'll always find a way to get into trouble.

I think Gareth and Ianto together would really give Jack a run for his money. As the seasons progressed, I think Gareth was given the chance to let more of his real personality show through. His confidence, cockiness and dry wit added a whole new dimension to Ianto's reserved, professional persona. It really was more entertaining when Ianto's "inner Gareth" was allowed out to play.