Merlin & Arthur
Merlin & Arthur shared a great friendship, is true that at first they were like enemies but as the series progresses their friendship grow a lot. Merlin needs of Arthur and Arthur needs of Merlin. Arthur goes with to every mission but in one mission Arthur had to go alone so Merlin decided to chase him. Merlin tries to protect Arthur everyday. Merlin and Arthur share something more than a simple relationship of a owner - servant, they are friends, for Arthur, Merlin is his only friend. he appreciates him and he won't let anything bad passes to Merlin, At times Arthur treat Merlin very bad but they are always in good terms. the only person that Arthur trust is Merlin. These two guys have a strong friendship that will live forever, Arthur dies in Merlin's arms and he make himself a proper funeral for his friend. Arthur is dead but Merlin is still waiting for him.
mERLIN & FREYA
Merlin met an innocent girl called Freya with who he shared a time, in the time he falls in love for her, she also felt something for Merlin, they were all the time together and they even kiss but inside Freya there where a demon that was attacking Camelot for that reason Arthur had to kill her and Merlin just did a typical funeral for her but he could see her one more time when he had to use a water of life that a king gave to him. Merlin suffered a lot when Arthur killed her and felt sad, he was really in love with her. she knew that she would die because the demon that was inside her body. Freya and Merlin was just in one episode together and then time later they met again, for some reason Freya knew that she would see Merlin one more time. They have a short and sweet relationship.
Merlin & Morgana
When Merlin saw for the first time Morgana he was shocked because she was beautiful then they worked together when King Uther sentenced Gwen to death, she thought that he has a crush on Gwen. As the time processes they share many times together and worked together and were close friends but when Morgana decided to betray Camelot, Merlin considered to Morgana as his enemy and he couldn't say anything because she was a Lady, but then she declared herself a witch and a traitor of Camelot. She was afraid of Emrys who in fact was Merlin, she thought that Emrys was the funny version of the old Merlin but at the end she discovers that it was Merlin all time.
Merlin & Gwen
When Merlin came to Camelot, he easy made friends with Gwen. Gwen started to have feelings for Merlin but Merlin didn't notice of that even when she kissed him once, as they were in the same level in the Kingdom as the servants of Prince Arthur & Lady Moragana they were very friends and close. When Gwen started to have feelings for Arthur and Arthur for Gwen, their friendship was less close and they passed less moments together but they were still very good friends. they were like that until Arthur decided to marry Gwen in the end of season 4 when Merlin and Gwen had a professional relationship.
Arthur & Morgana
Prince Arthur and Lady Morgana were very close since the begining of their lifes. At first it seemed that Morgana had a crush on Arthur and she was always near him and supporting him, Arthur had feelings for her too and he thought that she was beautiful, time after she find out that she was the half sister of Arthur and Arthur was in love with Gwen. when she decided to betray the Kingdom of Camelot he was very surprised as he said that he always considered Morgana as his own sister. Morgana wanted to kill Arthur no matter what she wants to be the Queen Of Camelot as she was the daughter of King Uther as well and if Arthur died she would take her place in throne. When Arthur met her sister again he was upset and asked to her what happened to her.
Arthur & Gwen
At first for Gwen Arthur was a rude and an arrogant Prince and for Arthur Gwen was another servant of Camelot and wasn't worried or concern about her until when he have to complete a task and stayed at Gwen's house, there Arthur kissed Gwen and Gwen was like it was fine. Back to the Castle they were like anything passed but then they started to show feelings for each other and concern is something was bothering to the other. Arthur loved Gwen more than anything and he was able to give up his title of King just to be with her. Gwen loved Arthur more than any man and she knew that he was ready to be a great king and even when he exiled her form Camelot she was still in love with him. Gwen and Arthur married and ruled over Camelot 3 years over Camelot, then Gwen ruled alone Camelot until her death.
Lancelot & GWEN
When Lancelot came for the very first time to Camelot, Merlin show to him Gwen, he started to had a crush on her as he said that she was very kind and beautiful. When Lancelot decided to walk away from Camelot, Gwen was upset as he was going out of Camelot, she confess to Arthur that Lancelot was her first love and Morgana already knew that, Arthur Knew that too and when Gwen decided to be with Arthur, Merlin felt sorry for him as he losed the girl that he love the most. As Arthur he would do everything for Gwen. When he noticed that Arthur had a crush on Gwen he decided to leave them together and be a knight of Camelot.
gaius & Alice
Gaius apart from be a wizard he is a Physician and when he was young he met a girl named Alice who was his assistant and as him she knows a lot of medicine, When she met Merlin they were in good terms but then he suspect of her as she have a Manticore inside of her but Gaius was so in love with her that he didn't notice that. Merlin was right and Alice had a Manticore inside of her and the Manticore was forcing her to kill King Uther but Arthur report her for trying to kill King Uther so she was in jail and it was sentenced to death. Actually Alice is a witch and is the most kind person that you could meet. Gaius was in love with her years ago. As Alice was under a influence he let her to escape. Merlin told to him that he could go with her but then he told to Merlin that if he did that who will take care of him. is known that Alice and Gaius were engaged 20 years ago.
Morgana & Morgause
When Morgause came for the first time to Camelot she was not only there to fight with Arthur, she was there to meet her younger sister Morgana, Morgana who in that time was having nightmares (that in fact were visions) Morgause gave to her a bracelet to stop of having those nightmares. Morgana was so pleased that as they started to meet and talk. When Merlin poisoned to Merlin she took with her to her sister and leave of Camelot but then Morgana were back and was causing problems for Camelot that Merlin was to resolve. Morgana betrayed Camelot and leave it so she started to life with her sister, later Morgause decided to sacrifice herself for the sake of her sister's plan.
merlin & gAIUS
When Merlin came for the first time to Camelot Gaius was surprised with him as he could use the magic without a to say a spell of learning to have it. As his mother sent with Gaius to learn about magic he started to teach him everything about magic and spells. Gaius always tell to Merlin that he have to not have scandals but the first thing that Merlin do is having scandals. Gaius always help Merlin with his problems. For Merlin Gaius is more than a father since he is always there for him. for Gaius Merlin is very important and he put his life on Merlin's hands everyday, he cared and worried about Merlin