Speaking to Ike won't add him, you must light his firework with a fart. This caught me out on playthrough 1.
Apologies, when I wrote it I thought I wrote defeat the kid by lighting the firework. Apparently not.
Originally Posted by ant1th3s1s
It might also be worth mentioning that you can create unlimited saves in The Stick of Truth. Save after every main quest and it's pretty hard to miss anything in the game.
Would be more beneficial to save before the main quest since you cannot go back to them, which is written in the guide. This way if you miss anything in the main quest you can go back and re-do the main quest.