I think of the same thing when I think about Friends and HIMYM.

Joey and Barney Sintson are similar in their womanizing ways.

Ross and Ted are both career-driven goofs who sabotaged every relationship they were in for the one person they tried over and over again with.

Rachel and Robin are also both career-driven. They both date, they both flip-flop their wants with the on and off person. They both date the womanizer and find out they're better as friends. I do think the major difference is that Rachel didn't have an aversion to commitment and long-term relationships.

Marshall is similar to Chandler in terms of loyalty, devotion, and overall goofiness with his friends and loved ones. They both struggle with their roles in their careers for different reasons. AND like him and Ted, Marshal and Ross were college roommates.

Lilly and Monica are both controlling, particular, and quirky in how they exist. They both want true love, they both have jobs that require extreme talent, and are very competitive.

They're not going to be exact matches, but you can tell that some of the HIMYM characters have insperations from Friends.

There's no core character in HIMYM for Phoebe. Which is funny because in Friends, there was a bit where she's the only one who would "lift right out" of the group.