A: Good question! Let's see if we can tackle this issue.
Firstly, it is impossible for Lucifer (who is also known as the Devil since he is the Fallen Angel) to repent of his sins. Because he was part of God's glory before (being an angel), he had the knowledge and the opportunity to turn to goodness, but chose the other route. So thus, he had the chance to stay in the presence of God but turned it down.
Secondly, the redemption that we receive through Jesus Christ was for humans only and was not meant to include angels or demons. It was necessary for God to provide a Saviour for those who needed saving. Angels do not require such saving and demons have already made their alliances.
Lastly, the Bible does not give us any hint that the devil would repent even given the chance to. It says that the devil is keen on bringing down God, indicating their desire to walk away from the light and make a stance against goodness. Thus, the fallen angels would be even more deserving of the wrath of God having full knowledge of that goodness, but choosing otherwise.
[answered by Pastor KJT]