How I Met Your Mother: 10 Worst Characters Who Appeared After Season One

10. Mickey Aldrin

The first of a handful of awful fathers to make this list, Mickey Aldrin was introduced in the fifth season episode Slapsgiving 2: Revenge of the Slap, where he attempted - poorly - to reconnect with Lily after years of estrangement.

Though the character benefits from the natural charm and comedy skills of actor Chris Elliott, Mickey quickly overstays his initial welcome, and what's more is that his development feels constantly at odds with itself.

Initially appearing as an absent father trying to make amends, every one of his subsequent appearances in the series finds him reverting to old habits of sleazy business deals and forcing Lily to get him out of trouble.

By the time the show comes to an end, he and Lily may be on good terms - and it's made clear he ended up being a great grandfather - but his redemption never feels earned or consistent enough to work.