Ramayana ends when the important characters leave this earth. Note that they left this earth by their choice and ended their life, not by a disease or murder. This is how each character left.
Sita felt ashamed and angry when she was again asked to go through fire test by the people of Ayodhya. She was overflown with emotions and decides to go back to the mother earth from where she emerged. She gives the responsibility of her sons Lava and Kusha to her husband Lord Rama, prays to Bhoomidevi (Goddess of Earth), the ground breaks into half and closes after Sita vanishes into it. Later, she reaches Vaikhunta and becomes Goddess Lakshmi again.
Sage Durvasa appears at Rama’s doorstep and seeing Lakshmana guarding the door, demands an audience with Rama. At the time, Rama was having a private conversation with Yama, the god of death. Before the conversation began, Yama gave Rama strict instructions that their dialogue was to remain confidential, and anyone who entered the room was to be relieved of their life. Rama agreed and entrusted Lakshmana with the duty of guarding his door. When Durvasa made his demand, Lakshmana politely refused. The sage grew angry and threatened to curse all of Ayodhya (including Rama’s clan) if Lakshmana did not immediately inform Rama of his arrival. Lakshmana, in a dilemma, decided it would be better that he alone die to save all of Ayodhya from falling under Durvasa’s curse and so interrupted Rama’s meeting to inform him of the sage’s arrival. Rama quickly concluded his meeting with Yama and received the sage with due courtesy. As Lakshmana was very dear to Rama and he was not able to hang his brother, with a heavy heart, Rama banishes him from Ayodhya, as banishing a person from kingdom is equal to killing.
There were times when Rama was away from his dear wife Seeta, his other brothers, parents and friends too. But we hardly find any moment when Lakshmana was away from Rama. Lakshmana was like a shadow to Rama. After banishment, Lakshmana was not able to live away from Rama. So, he felt that it’s better to leave this world than living away from his brother. Thus, he went to the banks of the river Sarayu resolved on giving up the world by drowning himself in the Sarayu river. He was the first one among the four brothers who left this world, reached Vaikhunta and became Aadhi sesha again.
After Sita left, unable to move away from the responsibilities, Lord Rama has to raise his kids Lava and Kusha and ruled the kingdom. His total ruling period since he was back to Ayodhya (after killing Ravana) was 10,000 years. At the time of Lakshmana’s demise, Shatrughna was ruling Mathura after killing the demon Lavanaasura. So, Rama has only one brother Bharatha left with him.
As informed by Yama, Rama has to leave this world and go back to Vaikhunta again. So, he crowns his sons as kings, informs Bharatha to send messages to his brother Shatrughna, friends Sugreeva, Hanuman, Jambhavantha and their monkey army in Kishkindha. Bharatha sent a message to Vibheeshana in Lanka too.
When they come to Ayodhya, he speaks with his brothers, friends like Hanuman and Vibheeshana etc.
In the presence of all, Rama entered into Sarayu river and came out as Lord Vishnu.
Bharatha enters sarayu river and comes out as Panchajanya, the conch of Vishnu.
After receiving the news of brother Lakshmana’s demise, Shatrughna comes back to Ayodhya after crowning his sons. Shatrughna enters Sarayu and comes out as Sudarshana Chakra, the discus of Vishnu.
Before Rama entering into the river, he speaks with Hanuman who requests a boon to Rama. He says “O Prabhu! Till your name is hailed on this earth, till people sing praises about you, I should be on this earth”. Rama grants the boon and Hanuman becomes Chiranjeevi, the immortal.
Hanuman was present in Mahabharatha too. He supports Arjuna by being on his flag “Kapidhwaja”. Few sources say the below pic as the real Hanuman pic captured few years before.
He’s going to be the next Brahma (next creator) too.
Lord Rama ordered Vibhishana to stay on earth, serve the people and guide them to the path of truth and Dharma. Hence, Vibhishana is considered one of the seven immortals or Chiranjeevins. Lord Vishnu also ordered Vibhishana to pray the family deity of Sun Dynasty, Lord Ranganatha.
In Mahabharatha too, Vibhishana was present and sends gifts to Yudhistira supporting him as Chakravarthy / Samrat, the king of entire world.
Jaambhavantha was present for the churning of the ocean and thus witness to the Kurma avatar, is supposed to have circled Vamana avatar seven times when he was acquiring the three worlds from Mahabali, fought for Rama with the demons in Lanka, fought with Lord Krishna for Shamanthakamani and gave that mani and his daughter to Lord Krishna for marriage. Jambavan may well be the longest lived of the chiranjivis and have been witness to nine avatars.
Thus, Hanuman, Vibheeshana and Sugreeva became immortals are are living now too.
Sugreeva & other Vaanaras
When Lord Vishnu was taking the form of Lord Rama in order to kill Ravana, all the gods sent their anshas (or partial forms) to earth who took birth as monkeys in order to help Rama in the war with Ravana.
Sugriva was the son of Lord Surya. Lord Sun / Surya sent his partial form as Sugriva to help Rama in the war. After receiving the message from Lord Rama, he makes Angadha, his brother Vali’s son as the king of Kishkinda and goes to Ayodhya. After Rama and his brothers, Sugriva also enters into Sarayu river, leaves the earth and goes to the world of Lord Sun.
After him, the other monkeys start entering into the river, leave their monkey bodies and come out in the form of angels or devas.
Lava & Kusha, the sons of Rama
Lord Rama installed his son Lava as the king of Sravasti and Kusha at Kushavati.
Later, Lava founds a city and names it Lavapuri (City of Lava) which became the present day Lahore in Pakistan.
Kusha founded the city Kusha which became the present Kasur city in Pakistan.
Thus, Rama along with wife Mata Sita, his brothers Lakshmana, Bharatha and friends Sugreeva and Hanuman established Dharma on this earth. Without showing any divine powers, he suffered as a normal human being and followed Dharma in all situations.
Rama is adored as the best king of all times. His rule as king is still adored as “Rama Rajya”. Do you remember any other king’s tenure like this?
Rama is the best king and the perfect human being. Sita is the best wife and symbol of purity, Lakshmana is the best brother and follower. Hanuman is the best devotee. No body can replace these people.
May this family pic of Rama makes your day great.