Lord Rishabha was the first Tirthankar of our time, and hence is also called Adi-nath, the First Lord. In Jain tradition, he is more than a Tirthankar. As a king, he is credited with development of several innovations affecting the society, as transition was being made from a simple to a more complex society:
prajaaptiryaH prathamaM jiiivishhu sashaasa
kR^ishsyadishhu karmasuprajaH.
(vR^ihat-svayambhuu stotra)
As first Prajapati, he taught people, who wanted to earn a living, various professions.
dhammo vi dayamuulo viNimmiyo aadi bamheNa.
(trilokasaara)
The "first Brahma" (Lord Rishabha) established the (ordinary) dharma based on compassion.
The ancient idols of lord Rishaba all show him long shoulder length hair. This is referred to by Acharaya RavisheNa in Padma-PuraNa:
vaatod-dhuutaa jaTaastAAsya rejuraakulamuurtauaH.
dhuumalva iva sad-dhyaan-vahnisaktaya karmaNaH..
Trans: Blowing in the wind, the locks of his hair looked, as if they were smoke coming out the fire buring the karmas.
The Vaishnava text Bhagavata-PuraNa also mentions the locks of hair of Lord Rishaba:
..kutila jatila kapisha-kesha-bhuumibhaaraa.
Rishabaha was the son of King Nabhi and Queen Marudevi. He is mentioned in all the Vaishnava/Shaiva PuraNas, as well as other texts. The Bhagavata says:
ashhTame merudevyaaM tu naabherjaata uruukramaH.
darshayan vartma dhiiraaNaaM sarvaashramanamaskR^itaM..
Trans. In the womb of Merudevi, wife of Nabhi, the lord had his eighth avatara. He showed himself in a form that is to be worshipped by all Shramanas. (Here the author of Bhagavata-PuraNa regards Lord Rishabaha as an avatara).
Bhagavata calls him "shariira maatra parigraha" (body his only possession), "gagana-paridhaanaH" (wearing the sky), vaatarashanaa (wearing the wind).
While some sectarian bias is apparent in some of the non-Jain texts, both Lord Rishabha and his son Bharata are mentioned respectfully in the Hindu Puranas.