Adults are never seen in the series, though they have been to the Cul-de-Sac. However, adults seem to have an off screen presence that seems to affect the main characters whenever they are near. Kevin's dad appears to work at a nearby jawbreaker factory, it is possible that an adult runs the Candy Store and Ed's mother seems to have blond hair. In one episode, Edd calls the parents back to the cul-de-sac, showing that the parents are all away during the day. However, Sarah constantly threatens to tell her mom on Ed and the characters sometimes get grounded, proving that the parents can come and go when they need to. In one episode, Eddy is thrown out a shop by an adult after he has the wrong currency. Rolf has been heard talking about his Nana numerous times. The Adults have never affected the story plotline before, no matter how horrible something happens done by the Eds or by someone else.
During an interview with Danny Antonucci, when questioned about the lack of appearances by adults on the show he responded that "That's intentional too, throughout the long days of summer you simply didn't see anyone else's parents about and sometimes you didn't even see your own. Take the 'Edd's parents' factor, their means of communicating with him via sticky notes, my parents worked long hours and they left me written messages in much the same way."
Some of the rare instances of an appearance of an adult include...
- Eddy's Dad and Ed's Mom in the episode "Mission Ed-Possible" though only their arms were shown.
- Silhouettes of Rolf's relatives were seen in the episode "The Eds are Coming,"
- Both Eddy's Mom's arm and the school photographer's arm was seen in the episode "Smile for the Ed,"
- Santa Claus briefly appeared in Ed, Edd n Eddy's Jingle Jingle Jangle which was also the first time an adult ever spoke in the series.
- The episode Ed, Edd n Eddy's Big Picture Show had the greatest appearance of adults, during the scene where Jonny was riding the bus. The whole bus was filled with adult figures, though they were completely static and their faces were never shown.
- In the very same episode, Eddy's big brother makes an appearance by the end.
- In "Toon Dates" there is a Drive Through Guy named Scoot, however he might be a teen.
- Plank's Parents are technically the only parents to fully appear in the show.
- It is also shown that The Kanker Sisters' mother is in some aspects like May (shown in Hanky Panky Hullaballo when May tromped on Marie and she responds "Now I know who got Mom's genes").
- The Kanker Sisters mother seems to have a negative attitude towards men, judging by the various insults she has directed towards men. This may be a direct hint that she divorced three of her husbands (i.e. Butch, Bubba and Rod).
- Double D's parents communicate to him by using sticky notes.
- The Adults (mostly Eddy's and Ed's parents) seem to be big, tall, (even taller than Ed, and Ed is the size of a regular adult) and get angered quickly.
- As seen in Ed, Edd n Eddy's Big Picture Show, Eddy's Big Brother is most likely an adult due to the fact he is old enough to own a car and lives on his own or if not a grown up then possibly a young adult .
- Nurse Prowse, the music teacher, and The School Photographer are the only Peach Creek Jr. High faculty members to have any body parts seen.
- Scoot the Drive Through Guy is most likely an adult too or if not then a teenager which is a young adult.
- ↑ "Chatting with Danny Antonucci by Kit R.R. Topp" http://web.archive.org/web/20040630135223/http://animationbymistake.fateback.com/abm/dannytalk.html