How I Met Your Mother focused on the core group of friends but there were many side characters who had surprising hero roles in the series.
How I Met Your Mother: 10 Low-Key Heroes On The Show
How I Met Your Mother: 10 Characters Who Appear In The Most Episodes Of The Series
How I Met Your Mother (TV Series 2005–2014) - Episode list - IMDb
How I Met Your Mother Natural History (TV Episode 2010) - Josh Radnor as Ted Mosby - IMDb
How I Met Your Mother Do I Know You? (TV Episode 2008) - IMDb
How I Met Your Mother: The 5 Best (& 5 Worst) Recurring Characters
How I Met Your Mother: Season 1
How I Met Your Mother Definitions (TV Episode 2009) - IMDb
How I Met Your Mother: The 5 Best (& 5 Worst) Recurring Characters
How I Met Your Mother: 5 Most Likeable Characters (& 5 Fans Can't Stand)
How I Met Your Mother: 10 Low-Key Heroes On The Show
How I Met Your Mother Oh Honey (TV Episode 2011) - IMDb
The How I Met Your Mother Characters are Terrible (Great) People
How I Met Your Mother (TV Series 2005–2014) - Series Cast & Crew - IMDb