None of them probably. Loki thought to himself, the River Keeper has no rivals in the Omniverse.
But most living beings would not know the existence of this being. After all, he is just guarding the river and never care much about anything other than that river.
Which is better.
If any of the reason he thought was true, then the River Keeper could easily blocks any of those three from meeting. Changes space and time here and there, changes routes of teleportation, freeze and unfreeze time, there is all kinds of methods that the River Keeper could do if that was really the case
But it is not.
Instead, the River Keeper seems to wait for the Child of the End to enter the tunnel of time and space before making any moves.
This is what makes him unable to see the true cause and effect of this matter.
As for the Songs, the colors and the breeze that is blowing in the garden, he could guess why.
