I gotta say that finding a decent "flagship" FWLM 'Mech carrying an LGR is going to be difficult. They're a hard weapon to fit to a 'Mech's weapon suite efficiently. I'd rather take an Ontos (LGR) over 99% of our LGR 'Mechs, for example. As for the LRM launcher being a Marik staple, I'd actually narrow that down to the LRM-15. Apollo, Trebuchet, Grand Titan, Albatross, Phoenix Archer, every Thunderbolt variant up to and including the TDR-9M, Yeoman; and that's just off the top of my head. The other rack sizes are used, sure, but I believe the number of designs carrying LRM-15s outnumbers them.