He created the Kage Bunshin to fool the sharingan and help him work harder.
He created Hiraishin for multiple reasons, but it needs better reasoning to why he made it.
Same with edo tensei.
He had "Creation of all things" one of Hogaromo's techniques.
Dude your rightHe was lonely, he created shadow clone jutsu to have his clones keep him company, and he created edo tensei in hopes of bringing back his dead friends and family. I bet he created FTG so in case his friends are in danger, he could teleport to them in a flash to save them. Tobirama kins puts a tough guy attitude, but his jutsus show he's a big cuddly teddy bear. Those are my thoughts.