Not to derail this thoroughly interesting conversation about how Felix is supposedly viewed in the world, but I have been thinking and have taken many opinions into account, and have revised my theory slightly. Note this has nothing to do with conformity, I am just slightly lazy and didn't feel like replaying all three games thoroughly before getting this out, so here it is.
The 4th and 5th game are now combined into one. The quest that Felix will give you will now be shorter by a little, to make room for the next game as well. The basic stuff stays the same, and I believe I have a reasonable guess as to the characters for the game even. If Felix is to marry Sheba, then they will have twins, an earth adept and a wind adept. A Proxian will be studying with Felix due to his ties with Prox, and Piers's child will be your fourth adept. If however Felix is with a Proxian (or any other person, it just seems that Proxian seems to be the most popular idea) he will still have twins, just they will now be earth and fire, and the random Proxian will go away. Sheba I can see with Piers due to their friendly relationship in the Lost Age. If this is so, there are your wind and water adepts. Now for your second party. Arhi is an obvious conclusion for wind adept. A Proxian would make the most sense for a fire adept. Water would be Nowell, and Earth would be Susa's child (I really can't remember names very well unless they are simple so...)
Continuing with the previous game, they do their thing, stop the problem at Anemos Inner Sanctum, and go to Sol Sanctum. They re-recruit the other eight members as well as any and all of the Warriors of Vale. They proceed into the Sol Sanctum and there game 4 ends now.
The 6th and 7th games are also combined into one. You go into the Sol Sanctum and perhaps you find yourself in the underground city previously described, but you could also be on the other side of the world as previously suggested. You still fight them and the ultimate dark power, possibly Dullahan, possibly someone else; and take out the psynergy vortexes. I don't know, I don't care at this point. You still must fight and defeat the leader of Tuaparang, and I think it would be most interesting if Tuaparang had taken over the whole of Weyard in your time underground. You still must take down Alex who.... (I had a brainwave) has fled to Anemos, which is in orbit around Weyard. He has set up “base” there, and has been there for a long period of time. From here he plans to attack the Wise One and take his power along with the ultimate evil to make himself the most powerful being ever. You go through Anemos and beat him the preliminary time. At this Alex will laugh and and tell you how pathetic you are. Then he will teleport away. You must follow him into the Wise One's realm (which needs to have awesome graphics and a totally sweet setting) and there you will have the final confrontation with Alex (which also needs to be very long, and have many parts).
Some general stuff that I have also revamped. We will need a major level cap boost. By the end of the 4th game you will be nearing the level cap of 99. The cap will need to be raised a lot, somewhere between 200 and 999. If they wish to input harder modes, where battles get extreme, then 999 may be required. If not then a lower cap would work. We will also need a bunch of new djinn. By the end of the 4th game, you will have 9 djinn for each person. They will need to raise the amount to 11 or 13 djinn per person