Lucifer Morningstar is the main protagonist of the Lucifer (TV Series) and is the main love interest of Chloe Decker.
Lucifer is the son of God and has many brothers and sisters who play their part. Lucifer was born as Samael, the Light Bringer as he was once originally one of God's best and brightest Angels. However, when Lucifer somewhat rebelled against his father, God sent Lucifer to run hell, devastating Lucifer and feeling immensely betrayed. Lucifer then reluctantly run hell for eons, developing a serious reputation and gaining a friend in Mazikeen. However, in 2011 Lucifer retired from Hell and decided to live on Earth in Los Angelus as a vacation. Since arriving on Earth, Lucifer has opened a nightclub "Lux". Eventually, Lucifer's life would change when in 2016 he would witness his friend, celebrity singer Delilah be murdered.
Lacking faith in the LAPA to catch the person responsible, Lucifer took it upon himself to catch Delilah's killer and soon began working with Detective Chloe Decker. Lucifer and Chloe manage to catch the Culprit and eventually begin working together to solve cases, but Lucifer faces other problems as his brother Amenadiel is trying to send him back to hell. While at the same time, Lucifer has began seeing therapist, Linda Martin who has also recently discovered the truth that he is in fact the Devil.
Chloe and Lucifer first met each other when Chloe began investigating the death of famous singer, Delilah, who was also a friend to Lucifer. Since their first meeting, Lucifer and Chloe's different personalities clashed, but soon they both began working together to discover who had Delilah killed. Lucifer soon discovers upon meeting Chloe that she isn't affected when he uses his powers on her. He is shocked and confused by thus, but finds Chloe interesting. Since then, Lucifer and Chloe have began working together to solve cases and although Chloe refuses his help in the beginning, they soon discover they make a good team and after Lucifer officially becomes a consultant for the LAPA, Lucifer and Chloe officially become partners. While Chloe is shown to be constantly annoyed by Lucifer especially his claims that he is the Devil, but despite how he acts, she does enjoy working together with him and sees him as a good friend.
In the second season, Lucifer and Chloe's relationship continues to grow stronger and they become more closer as when Lucifer learns about the case regarding Chloe's deceased father, John Decker. Since they began working together, Lucifer is also shown to be openly attracted to Chloe and reveals his wishes for them to sleep together, but Chloe always rebuffs Lucifer's advances. Lucifer's relationship with Chloe is shown to have grown so much that when a drunk Chloe attempted to sleep with him after Dan supposedly officially ended their marriage, Lucifer refuses to take advantage of Chloe. However, unknown to both Lucifer and Chloe, they both have slowly been developing genuine romantic feelings for each other, but are somewhat oblivious to them and always deny the feelings when confronted. However, recently in the second season, Lucifer and Chloe have finally begun to realize their true feelings for each other and they are shown to become more obvious as several people have started to become aware of their growing feeling.
Since finally realizing their true feelings, Chloe and Lucifer finally begin express to them, eventually leading the two to almost share their first kiss until they were interrupted by one of Lucifer's exes. Lucifer then begins to try and show Chloe that he genuinely has real romantic feelings for her. However, Chloe still refuses to start a relationship, claiming they are both different people, but clearly Chloe's feelings for him grow stronger, showing jealously towards Charlotte Richards, believing she is an ex-girlfriend of Lucifer. Eventually, Lucifer decides to give up his pursuit of beginning a real relationship with Chloe, believing she deserves someone more worthy after looking back to his previous relationships. However, when Lucifer begins to reveal everything he loves about Chloe, including her middle name, Chloe and Lucifer finally share their first kiss.