Even though God Almighty tells Touya he can keep his phone charged with magic, at no point is he seen doing so. Suggesting it sponges off Magic from the air
Touya having children will be a little odd.
Else and Linze are twin sisters; so their children with him will be sibling/cousins
The same applies to Yumina and Sue, who are already cousins.
The original author regrets the translation of Phrase; thinking a different name should have been better. Having no idea at the start the Phrase would become the main villains.
Though Touya was asked for his opinion in whether he wanted to marry Yumina, Linze, Elze, Yae and Sakura, the girls outright ignores his feelings when it came to Lucia, Hilde and Leen. Sue manages to guilt Touya into accepting.
Touya's summoned Beasts (the Four Monarchs) can indefinitely due to his endless magic supply. Though if he disappeared from the world, they would return to where they originally came from.