what significance it has in other religion?
In Jainism, he is the attendant Yaksha of the 19th Tirthankar Mallinath.
Kubera
In Jainism, Kubera is the attendant Yaksha of the 19th Tirthankar Mallinath. 
what is the relation between kuber and ravan in mythology Kubera is described as the uncle of Ravana in the "Mahabharata". what is this former one worshipped for? He is worshipped as the god of wealth.
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Kubera [SEP] In Jainism
In Jainism, Kubera is the attendant Yaksha of the 19th Tirthankar Mallinath. He is usually called "Sarvanubhuti" or "Sarvahna", and may be depicted with four faces, rainbow colours and eight arms. The Digambara sect of Jainism gives him six weapons and three heads; while the Svetambaras portray him with four to six arms, numerous choices of weapons, though his attributes, the money bag and citron fruit are consistent. He may ride a man or an elephant. He is related to the Buddhist Jambhala rather than the Hindu Kubera.