The kingship of Jesus of Nazareth, the Christ, hides and manifests itself in His suffering and death on a cross. It is there that He souvereignly forgives. It is there that criminals are confronted with Jesus' claims and it is there that their eternal destiny is at stake. There Jesus' promise to the repentant and believien criminal is also souvereignly ratified.
See Rev. Castellina's sermon on Luke 23:33-43 at this link: https://sites.google.com/site/pastorpaolo/sermons/a-crucified-king