The Ronaldo-Kendall Relationship (a.k.a Rendall, or Kenaldo) is first established in Frame Story. It consists of Ronaldo and Kendall Perkins.
- Ronaldo is about to read a poem to Kendall about his love towards her, but after he says it is written in only ones and zeros, Kendall calls him the "worst secret boyfriend ever."
- Ronaldo wants to give Kendall a romantic dinner.
- Kendall thinks Ronaldo made a wooden statue of her.
- Kendall wants Ronaldo to be more awesome.
- Ronaldo wants to please Kendall, but he doesn't know how.
- When Ronaldo performs a stunt and crashes into the sign, Kendall looks and rejoices.
- Kendall goes to the hospital with Ronaldo.
- Kendall is collecting sap for Ronaldo's birthday.
- When Ronaldo calls Kendall, he says he's excited to see his darling.
- When Kick throws the cat at Ronaldo, Kendall said: "My poor Ronaldo".
- Kendall and Ronaldo had planned to have a romantic dinner for Ronaldo's birthday, but Kick has to come along as well due to his and Ronaldo's hands being stuck together.
- When Kendall walks in the detention room, Ronaldo is the one most worried about her.
- Kendall joins the group because her boyfriend joins.
- Ronaldo asks his darling "why she was in detention?".
- Ronaldo is the only person who likes Kendall's report.
- He's the only one who doesn't join Kick at the Van Der Deth Halloween party and stays with Kendall.
- Both of them play the title roles in "Romeo and Juliet".
- Ronaldo votes for Kendall, but after he votes for Gunther.