|Aaron And Griffin Kunitz As Johnny DiMera|
|Days of our Lives|
|Portrayed by|| Ethan and Morgan Darling (2007)|
Ranger and Wiley Murphee (2008)
|Current status||Former; Recurring|
|First appearance||October 23, 2007|
|Last appearance||October 30, 2014|
|Created by||Hogan Sheffer and Meg Kelly|
|Introduced by||Ken Corday and Edward J. Scott|
|Fullname||John Roman DiMera|
|Alias(es)||John Roman Horton|
He was born October 23, 2007. He was originally believed to be the son of Lucas Horton, but after the child's birth, EJ begins to suspect that the fraternal twins might have different fathers because Johnny does not look like his sister. A second DNA test reveals EJ to be the father.
Johnny's paternal grandfather, Stefano DiMera was pushing to meet his grandson and insisting that EJ raise Johnny as a DiMera against Sami's wishes. EJ first resists this notion because he does not want to betray his ex-wife, but since finding out that, Grace was "his" daughter he agrees to raise Johnny as a DiMera against his ex-wife's wishes.
Johnny has one older maternal half-brother Will Horton, twin maternal half-sister, Allie Horton, and one sister, Sydney DiMera.
Sami has allowed Johnny to live with his father, Nicole Walker and his grandfather in the DiMera mansion, while under the protection of the federal government as a material witness to a murder.
After his father died, Johnny currently lives in the Los Angeles with his mother and sisters Allie Horton and Sydney DiMera. Johnny became an uncle when Will fathered Arianna Horton.