Spencer and Harper

 are main characters of iCarly (2021). They are neighbors and live in Bushwell Plaza.

Relationship
Spencer and Harper know each other through their relationship with Carly. When Carly invited Harper to be her roommate, Harper and Spencer become neighbors.

Harper and Spencer don't always see eye to eye. Harper sometimes doesn't take him and his art seriously, and she referred to him as "a ding-dong." Despite the two not being particularly close, Spencer cares what she thinks about his sculptures and seeks her approval.

iStart Over

 * Spencer wanted Harper's approval of his sculpture and even tried adding her sunglasses to it.
 * Harper says the sculpture is great even if she doesn't like it.
 * Spencer wants Harper to like his sculpture as if to impress her.

iHate Carly

 * When Spencer returns and says he can't see, Harper jokingly says "too bad, I'm super naked".
 * Spencer asks Freddie if Harper really is naked and says it so casually that its almost like the thought of it doesn't bother him.

iRobot Wedding

 * Spencer and Harper dance at Nevel's wedding
 * Spencer and Harper compete to see who can get the most phone numbers from wedding guests.
 * Spencer calls Harper hot.
 * Spencer accidentally puts Harper's number in his phone.

i'M Cursed

 * Spencer tells Harper to come upstairs as he has something important tell her about Carly's birthday plans.
 * Harper tells Spencer that her idol came to her work and that she froze, as she didn't know what to say.
 * Spencer invites Harper's idol to Carly's birthday party at his apartment so that Harper can have a do-over.

iLove Gwen

 * Spencer and Harper played pool table together.
 * Spencer and Harper got competitive together to get the prize from Millicent's school play.
 * Spencer and Harper got their blue ribbon and got promoted to become co-chair for the PTA (Parent-Teacher Association) at Ridgeway Junior High.

Credits to

 * iCarly Wiki on Fandom