Simms was born in 2236. He grew up in Megaton and understands better than anyone what it takes to survive and thrive in the wasteland. Big and imposing yet warm and friendly, Lucas won his position by a unanimous vote of the people of Megaton (most of whom genuinely love the guy). He serves as mayor, sheriff, judge, and just about any other position that's needed. It's also no secret around Megaton that Lucas Simms is fulfilling some weird childhood cowboy fantasy. He named his son Harden after the Old West outlaw John Wesley Harden. Simms is also a member of a secret society known only as "the Regulators."
He often contests the title of Mayor with Colin Moriarty. While Moriarty claims Megaton to be 'his city,' every resident comments on how Simms is the real Mayor. Simms warns the player of talking to Moriarty, saying the same to his son. Likewise, Moriarty despises Simms.
If Simms is killed there are unique dialogue choices with Manya and Harden Simms.
If you choose to tell Lucas about Burke's plot, you can save Simms by killing Burke before he has a chance to shoot Simms. This also spawns a dialogue choice of Lucas commenting on how he "Must be getting slow" and will thank you for saving his life.
If you choose to tell him that you plan on detonating the bomb, he will turn hostile along with every other Megaton settler.
If the player chooses not to save him and then kill Burke the player will receive positive Karma and has the option of looting both of their bodies with no additional negative Karma. This is an easy way to get the Chinese assault rifle very early on in the game. You can then receive the reward for disarming the bomb from Lucas's son Harden.
xbox360 When Simms is killed by Mister Burke, a floating blood splatter can sometimes be found walking the same path that Simms once did. It can cause the game to freeze and you will need to restart the console. [verified]