After giving it some serious thought.
Fang Mo still decided to stay and be Little Rin's friend for the rest of her life.
After all, he had the Dummy Mod. Theoretically speaking, there was no upper limit to the number of avatars he could create.
If he was willing to endure the discomfort of splitting himself apart, he could create new entities almost whenever he wanted—like a Sixth Entity, Seventh Entity, or even some bizarre thing like Entity 303 or 404.
Although Fang Mo treasured the humanity he still possessed.
There was one thing he had to admit: his standing had already surpassed that of humans by far.
He had agreed to Little Rin's request to be friends for life, but that applied only to the Fourth Entity itself. It would not affect the operation of his overall will.
In any case, Fang Mo had more than enough avatars. Even setting aside the Lord of Multiple Dimensions, Player Mofang, the Asgard God-King, and Magnetic Field Martial God Shirako, he still had a Fifth Entity sitting idle. It would not delay his work or his antics at all.
Besides, the flow of time differed from universe to universe.
Considering how brief a human lifespan was, even if he truly accompanied the little girl through her entire life, it would be no more than the blink of an eye to Fang Mo as he was now.
What was more, this little one was Rin Tohsaka after all.
Once she grew up and awakened her tsundere traits, she might very well shove him away in utter disgust. Wouldn't that set him free again?
And Fang Mo had already thought it through. What Little Rin had wished for from the Holy Grail was for him to stay by her side forever, not to stay