<Tr> <Th> Children </Th> <Td> Wyatt Halliwell Chris Halliwell Melinda Prudence Halliwell </Td> </Tr> <P> Leo Wyatt is a fictional character from The WB television series Charmed, portrayed by Brian Krause . A possible breakout character included in the writing initially as a love interest beginning in the first season that initially set Phoebe and Piper bickering and competing for his attention . He appeared as a guest star in seven episodes of the first season and six episodes of the second season . Midway through the second season, he joined the main cast and appeared in all but 11 episodes for the rest of the series' run . All together, he appeared in 145 episodes--the most of any male character in the series, and the most of any character who was not a Halliwell by birth . </P> <P> For most of the series' first five seasons and part of the seventh, Leo was the Charmed Ones' Whitelighter--a guardian angel and mentor in all things magical to the three sisters as they grow in their power . As a Whitelighter and later an Elder, Leo had the ability to orb (magically teleport) from place to place . He could also sense his charges (those he guided), that is, he could telepathically hear and locate them . Other powers included hovering, healing physical wounds, and changing his appearance (glamoring). He was nearly immortal, but like all Whitelighters, he was vulnerable to a Darklighter's poison arrow . He eventually wins Piper's heart, and they marry in 2001 . They have two sons, Wyatt and Chris, and a daughter, Melinda . </P> <P> In the series' fifth, sixth, and seventh seasons he became in succession an Elder, and then an Avatar . However, late in the seventh season he became a normal human, albeit one with great knowledge of magic . </P>

When does piper know leo is a whitelighter