The React series has had a very large cast, past and present, so this page is created to list people with very similar names and help differentiate them.
- The series have even got two Adams; the Teens React regular (who has graduated to Adults) and Tay Zonday, whose real first name is Adam. There was also one Adam who lasted only one episode.
- After the guest appearance of Alex Steele ("Teens React to the Honey Badger"), they've managed to get a male Alex for their next guest ("Teens React to Jacksfilms"), and a regular Alix (who since moved to Adults). Then there was an Alex who's a regular in Elders, and the Alex from the FBE staff (best known for Challenge Chalice), two Alexes who are regulars in the Kids cast (one has since graduated to Teens), plus guest star Alexa Bliss.
- Two of the FBE staff members are named Alyssa, only differentiated by their last initials.
- The series has several Annas: Anna Akana and Anna Brisbin aka Brizzy Voices on YouTubers, plus two Annas on Teens.
- The series has had a Brooke-Monae, a Brooklyn, and a Brooklin, all of whom are addressed simply as Brooke.
- There's Ethan and Ethan James. Both went from Teens to Adults.
- There have been two Emmas. The original is a very wise kid, being the original user of the "[Name of Troper]'s Words of Wisdom" overlay. The second one, initialed Emma R., is initially known for her antics then later her kranky demeanor.
- The Kids has had Jackson and JaxonHH. Both have since graduated to Teens.
- There have been at least four Jakes, two Jacobs, and an effeminate Jayka.
- The series has two Jennifers: one is an original cast member on Adults, while the other is a regular on Elders. Additionally, Adults has a Jen and a Jen D., plus YouTubers recurring cast member Jenna Marbles and Jenna from Kids who is a regular since 2015.
- The series has several Jordans, including Jourdan and a Jordyn.
- There's original Breakout Character and Series Mascot Lia Marie Johnson and a one-off reactor named Liat.
- The series have an Elders regular named Lloyd, with EpicLloyd from Epic Rap Battles of History being a regular on YouTubers.
- The series have also had two Lucases; one guest on Teens, one regular on Kids.
- A second Madison was introduced in Kids in 2016. The original was an inaugural Teens cast member and has since graduated to be one of the inaugural Adults cast.
- Two of the FBE staff members are named Megan, only differentiated by their name spelling (one Megan and another Meghan) and also differentiated by their last initials.
- It took a while but the show managed to have three Morgans; Morgan Bertsch (the original), Morgan A. who debuted in "Kids React to Grumpy Cat" two years later (who was since graduated to Teens), and the third and oldest Morgan who debuted in Teens (who was since graduated to Adults).
- Teens had both Rachel and Rae. When the former joins the FBE Staff (before which she has graduated to Adults) she's initialed Rachel F., meaning there was a staff named Rachel beforehand.
- There have been two Teens regulars named Rebecca, one of which goes by Becca (though still addressed in her full name by Benny Fine), YouTubers recurring cast member Rebecca Black, and guest star Becky Lynch.
- Teens had for some time in 2016 two Sabrinas; the first had been a regular for three years, before being promoted to Adults. After a year-and-a-half, the other Sabrina was also promoted to Adults, playing this trope straight once again.
- The series has two Sergios: one is a regular on Teens, while the other is a regular on Adults. The former has now moved up to Adults, but who among the two will be initialed remains to be seen as they have yet to appear on a same episode as of this edit.
- There's a prominent regular named Seth, plus guest stars Seth Rogen and Seth Rollins.
- The series has had two Shannons. One is a redhead female who has a twin, one is an Ambiguously Brown male.
- "Kids React to Old Computers" introduces a second Sydney, except they forgot to initial her last name like they've done before. It helps that the two Sydneys are separated by generations and have different personalities. Then Echosmith guest starred on Adults in Season 8, allowing the show to have a third Sydney (the band's lead vocals, who for some reason wasn't initialed either). And since the last one is blonde, this allowed the Sydneys to complete the trifecta.
- There have been two Tylers from Kids (one has since graduated to Teens), one from Adults, recurring YouTubers cast Tyler Oakley, plus three others who only appeared for a while.
- There was a Victor in Teens and four Victorias: a regular on Elders, a minor reactor on Kids, a reactor on Teens who debuted in 2018, and Tori (who doesn't like to be called by her first name).
- There's also original Kids reactor William, original Elders reactor Bill, and eventual Teens reactor Will (who was credited as William in at least one episode, plus React to That).
