Kamba Ramayana, A study 22, Briefly Lakshmana

The author says the mainspring of Lakshmana's character is not valor or heroism, though he possesses these qualities to a wonderful degree, but love - an all absorbing, self-forgetting love - for his brother, the chief of his race and first of men.

He accompanies Rama to the forest, learns to invoke magical weapons from the rishi and marries a daughter of Janaka, but generally he is a shadow of Rama. Back in Ayodhya he is different. His anger when he hears about Rama being deprived of his crown was uncontrollable, he looked like Adi Sesh himself. 

Lakshmana is ready to rebel and gets prepared to fight. Rama tries to cool him down, asking him to think of Bharata and his parents, but Lakshmana bursts out, 'I know not father, mother or Lord: thyself alone art mother, father, master, all to me. Thou hast learnt to give away what is thine, now see me give back thy own to thee.'

 When asked to stay back, his love receives a shock, and like a wounded lover, asks 'in what way have I offended thee?' and continues 'all that is thine own thou leavest here, wouldst thou abondon also us?'

And he keeps his word, 'when you, go about for pleasure on mountain slopes along with Sita, I shall do every task of yours, whether you are awake or asleep'. Guha sobs aloud when he sees the devotion of Lakshamana as he watches over Rama and Sita as they sleep.

This intense love for Rama makes Lakshmana regard as his own mortal enemies all who have injured Rama. He never stops to inquire whether they have actually injured Rama. This passion of hatred clouds his mind in all that concerns Kaikeyi and those connected with her! So when Bharata comes to the forest to request Rama to return, Lakshmana suspects that he has come with a hostile design on Rama.

He is always wary about the safety of Rama and Sita and while they are enamoured by the golden deer, he suspects treachery. When he and Rama return and find Sita missing, he is the one who calms Rama and suggests that they follow the track left by Ravana's vehicle. He is the one who is practical and supportive of Rama as they go looking for Sita.

The author then describes the war between the brothers and the Rakshasas in detail, Lakshmana's bravery and how miracoulously he is saved and is able to finally defeat Indrajit who had bound him in an astra. But there never was a mention of his wife Urmila anywhere as the author anayses the personality of Lakshmana.

I am sure the modern day psychiatrists wold have a label for this behavioural type.
Urmila is a tragical figure as also a heroine in the Sita mould, after all she stayed back to serve her m-i-l's. If you are interested Maithili Sharan Gupt's work on Urmila is worth study.