He is the first infected you see in the game, during the outbreak night in Hometown.
In the early hours of September 27, 2013, Jimmy has already turned into a runner. He catches Joel outside and covers him in blood, chases him home, and slams against the patio door until it gives way.
When Jimmy breaks through the glass and charges, Joel shoots him in front of Sarah. The two leave his body in the house as they flee.
You meet Jimmy while playing as Sarah, the only stretch of the game where she is playable. She has wandered the house after a cut-off phone call from Tommy and finds her father in his study as he rushes in through the sliding door from the backyard. Joel takes his revolver from the desk drawer, steps between Sarah and the glass, and warns Jimmy to keep back. Hometown is also the first time you see the revolver, which Joel later hands to Tommy so he can carry Sarah.
Rose Graham
Rose Graham is the KATX Channel 2 News reporter Sarah watches on Joel's bedroom TV in Hometown. Her live report from downtown Austin is the first real sign that the riots are something worse.
Sarah Miller
Sarah Miller is Joel's 12-year-old daughter and the character you control at the start of The Last of Us Part I. In Hometown you walk her through the family house near Austin on the night the infection breaks out, before Tommy drives the family into the chaos.
Joel Miller
Joel Miller is the man you play for almost all of The Last of Us Part I. A hardened smuggler in the Boston quarantine zone, he takes a job escorting 14-year-old Ellie out of the city, and the drop-off turns into a year-long trip across the country to find the Fireflies.
Tommy Miller
Tommy Miller is Joel's younger brother, a former Firefly who now helps run the settlement at Jackson, Wyoming. He drives Joel and Sarah through the chaos of the prologue, and twenty years later Joel tracks him down at a hydroelectric dam in the chapter Tommy's Dam, hoping he will take Ellie to the Fireflies.