1-'' Goodbye Time traveler MC'' and Butterfly and all the other version of Alex loses their ''special power'' since Alex has now fully ascended.
According to the Ts final words, the cycle will repeat and after a certain time ( could even be after billions of years) a creature refusing to accept his destiny will usurp Alex's power the same way Alex did to Ts.
Alex will have to challenge and fight this creature in order for this new creature to ascend into being the new God of time and to ensure the continued survival of their ''Reality''
Basically, Alex is now Tlo'slakh and the new slave of the ''SYSTEM''
2- Alex will not return. He no longer has a corporeal body or human emotions. His human body and his human emotions will only return when the new creature usurps his power.
But Mirall, Carmine, and anyone Alex knows will be dead by then so he will never see his loved ones again.
3- In the game ''Butterfly'' and more exactly in the scene where Butterfly meets Zero at his wedding. He jokes saying that Zero might still want more of his life years but Zero laughs and calls him clueless. This is a hint that Zero never took a single second of Butterfly's life.
She felt bad seeing him getting horribly bullied for years so she showed herself and gave him the power to read minds but lied to him saying that each time he uses it, his lifespan decreases.
She did this partly because she didn't want him to get addicted to this power but mostly she thought it will be more fun to lie to him.
Just Zero being Zero.
4- Ts was never evil, he was just a slave to the SYSTEM doing his role to ensure the continued survival of the ''Reality'' and to ensure Alex ascends into Godhood.
In the song that plays at the end of the game ''Carmine'', it says ''
'' Victims of the SYSTEM say isn't so ''.
I chose this song mostly because of this very fitting line that describes every character in the series.
EDIT : The drunk driver is the true villain of the series. If only his car battery was dead that day haha