Lily: So now we don't have a guardian.
Ted: You know, as your best friend, if called upon, I'd be honored to raise Marvin.
Robin: If you want him to be raised by his underwear on a flagpole, Ted's your guy. If you want him pulling the chord on some other nerd's panties, I'm your guy.
Barney: I'll teach that kid how to be awesome in ways you and Lily never could. It's going to be legend... wait for it - no, I won't wait for it and neither should little baby Marvin, so maybe it's better if you two just die right now - ...dary.