This is . . .

Rose of Sharon Cassidy (Fallout: New Vegas)

Jeannie May Crawford (Fallout: New Vegas)

Jean-Baptiste Cutting (Fallout: New Vegas)

Luc the Human (Original Shelter character)

"Fallout Shelter" has a ton of "legendary" characters you can recruit into your vault who are references to famous characters in the mainline games, all rendered in the iconic Vault Boy/Girl style. Even though they've been given the cartoon treatment, can you tell who the pictures are supposed to be>