He loves to entertain people them smile. Giving those whom are extra kind to others small little gifts such as flowers, balloons, or even giltter. SplendorMan enjoys giving back to them. (AKA Splendy).
His personal relationship with his brother is unknown, as the two are only shown together in fan art, although many fans believe Slender Man either does not approve of his older brother's cheerful nature, and SplendorMan either does not understand his younger brother's behavior or disapproves of his murderous behavior.