Your imaginary friend is:
BING BONG from the DISNEY MOVIE INSIDE OUT.
I just imagined that instead of solving puzzles, I could make friends by making my own.
He was the imaginary friend of Riley Andersen in the movie!
The first rebus on the top
is TABLE (times table)+ TEN (the number)IS (equals sign) which makes TABLE TENNIS. We are then supposed to convert this to its synonym: PING PONG…
The second rebus (18th)13.
is (r)13 thus replacing the 18th with r since it is is the 18th letter of the Modern Latin Alphabet. This hints at the rot 13 substitution cipher.
What to do with the C=O?
The puzzle then wants us to apply the cipher to both of the letters in C=O as hinted by in the arrow pointing to it and doing so we get P=B.
And so putting everything together we should change the letter Ps in PING PONG into Bs and doing so we get BING BONG.
Bonus
BING BONG is known to cry candies. The two letters are ‘C and Y’ making ‘CandY’.