Dragon Ball (Official Colored) - Vol. 9 Ch. 112 - Go, Goku, Go!

[MangaDex]

 

[Omb74]

It's subtle, but Shenron sticking around long enough to see Upa and Bora reunite are the first sign of him having a personality.
He might be more reserved compared to Porunga, likely due to being younger, but it's clear he takes after Kami to a degree.

 

[Buttzilla]

Makes you wonder why they don't catch the balls before they scatter every time. Save themselves the trouble of finding them all again next time.