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

There's a recurring issue plaguing characters on this list - narrative inconsistency. When Nick is introduced, he's seen as intelligent, charming, and a promising match for Robin.

But then he's gone, and when he finally returns to the show and starts dating Robin, he's shown to be both staggeringly dim-witted and one-dimensional. His main characteristic is that he has a six pack, and that's basically all you need to know.

Ultimately a forced attempt to throw up one last roadblock into the path of future couple Barney and Robin, Nick moves between personalities and appearances with little care or tact, and his inconsistencies are impossible to forgive.

There's an interesting character in there somewhere, but no one involved in his development seems overly concerned with finding it, which is hard to accept given how intriguing he was during his debut.