A few edits i made for my EarthBound 20XX AU if it had a romhack
Lovesick effect and call screen for Jeff
The Lovesick effect can only affect Jeff, but works the same as Ness' Homesick effect and can be cured by calling Tony. In EarthBound 20XX, Paula can also get homesick, as an additional feature to justify all the kids except Poo having mobile phones in this AU. Her call screen looks the same as Ness'.
In EarthBound 20XX, Jeff and Tony have recently started dating as of the events of EarthBound and Jeff will start to miss Tony if not kept in touch with him. Calling Tony at least once in your playthrough will also replace the dialogue where Tony feels like a nuisance for trying to call Jeff with a dialogue where he's happy to hear about Jeff and to know he missed him on their adventure. Maxwell will save your game like he does when you first play as Jeff.
The call screen appears when you either have Jeff at the top of the party by having Ness and Paula unconscious and then using a stationary telephone/payphone or by using Jeff's phone from the inventory. The same goes for Paula's call screen, where she has to be on top of the party or by using Paula's phone from the inventory.
Each party member will also be able to use the phone of another member to call their contacts, in the case of Ness and Paula you'll read their names before the parents' contacts in the call screen, Jeff's call screen will stay unchanged. The Escargo Express will have the usual Tracy dialogue when Ness calls, otherwise there will be a generic dialogue for the other members.
Alternate outfits for Jeff and Tony and New Chosen Four on top of Mt. Itoi
These are for another hypothetical romhack taking place in the same AU, 4 years after the events of EarthBound. In this second entry, Giygas wants to eliminate every reality in which George has stolen the information about the PSI, so the New Chosen Four have to travel to an alternate reality, where Ninten and his friends haven't defeated Giygas yet.
Jeff and Tony don't wear their school uniforms during the game, but instead personal casual outfits. (Ignore them still wearing their uniforms in the screenshot edit, it was made before i made the seperate sprite edits)
Tony will be a party member in this entry, with his weapon of choice being a crossbow, which he can assist Ness and Paula in their PSI attacks with by shooting a bolt through the PSI. This will work with PK Thunder, PK Freeze and PK Fire. This will cause the original PSI damage along with the crossbow damage and a bonus from the charged bolt. This serves as compensation for him not being able to use PSI. Additionally, due to his connection to Jeff, he can use bottle rockets as well.
While the prophecy for the most part has remained the same as last time, it is revealed that there is a vital difference. The difference being one of the kids being replaced by another, Poo is being replaced by Tony as he has to tend to his royal duties as prince of Dalaam. Additionally, Tony is chosen because, while he does know about the trauma Giygas has caused the original Chosen Four, he hasn't experienced said trauma, which gives him an advantage in the final boss fight as Ness, Paula and Jeff will recieve a "Traumatized" effect, which causes their offense to drop significantly and their defense to rise slightly, while Tony gets the "Protective" effect, in which he'll occasionally take attacks directed at the others and both his offense and defense rise significantly.
Dr. Andonuts has found a way in which time travel doesn't destroy the human body and refined the phase distorter to also hop between realities while travelling through time.
During their hike on Mt. Itoi, Ness gets a call from his father and it's revealed that in their reality, Ness' father has defeated Giygas before, along with Dr. Andonuts, who are then revealed to be Ninten and Lloyd. Ninten reveals that the lullaby he has sung to Ness as a baby are the original Eight Melodies, the same lullaby that Maria sung to Giygas, and the only way to defeat him.
Ness will tell the others so they know what exactly to sing when they need to. If you decide to choose the sing option as Tony, who is known for having a beautiful singing voice and enjoying singing but also for losing his voice when anxious, there's a big chance you'll get a textbox saying "Tony tried to sing the Eight Melodies, but he lost his voice."