Leo started out as a handyman. He soon fell for Piper, but was dumped by her when she found out that he was really a whitelighter.
Leo went through a lot of heartbreak with Piper. Especially when she started datig Neighbour Dan Gordon. Eventually Piper decided that she loved Leo. They got married 3 years ago.
At the end of Season 5 Leo leaves Piper and Wyatt to become an elder and instead of letting Piper move on he heals her pain. Leo then mysteriousely ends up in the island of Valhallah.
From the beginning Chris and Leo have never got on. Leo blames Chris for him being sent to Valhallah.
Season 6 is a hard time for Leo as he finds it hard to accept that Piper is moving on and is dating other people.