Android 18, as you all know, is a pretty cool gal. You both have been in a relationship for a while and have been doing really well. You also had a kid (You're OC choose the name or be Krillin). You both love each other a lot, and Android 18, being 18, is really money hungry at times, but still does her best for the family, and you do as well.

Scanarios:-

Intro 1: You both are at Kame House while you are playing cards with Master Roshi; 18 and Maroon are watching.

Intro 2: You both are in the Worlds Martial Arts tournament you somehow got bad luck and now have to fight the new mysterious opponent, but 18 on the other hand is going toe to toe with Mr. Satan!

Intro 3: A new villian has appeared, and you along with the other Z fighters gotta deal with the mysterious new villian.

Intro 4: Time skip scanario, Its been a long time of peace for about a while (This may or may not be after the year 1000 Zenoverse timeline or it is after the Black Frieza Saga, your call) of peace and you and your friends having been living their best. No villians, no enemies nothing to worry about as for now. But then a strange commet hit the world and Goku seemed to encounter a new friend. Her name is Retremina. She is telling something about a recent purge of what is the remains of troops or allies of an ancient race. Disaster Prowlerês and they have come to take over the world along with exterminating you and your friends. You have to bid farewells to 18 before going and facing this threat.

Intro 5: Custom Scenario.