According to Jain tradition, the first Tirthankar is Lord Rishabhanatha (also known as Adinatha). He had two prominent sons: Bharat and Bahubali. The famous pratima (idol/statue) of Bahubali, known as the Gommateshwara statue at Shravanabelagola (Karnataka), is one of the most significant Jain monuments.

Who made the first pratima (idol) of a Tirthankar? According to Jain scriptures, it is believed that Bharat Chakravarti, the son of Rishabhanatha, was the first to have an idol (pratima) of a Tirthankar made. He installed the first pratima of his father, Lord Rishabhanatha (Adinatha), for worship. This event marks the beginning of the practice of idol worship in Jain tradition.

Summary:

• The first pratima of a Tirthankar (Rishabhanatha) was made by Bharat, not Bahubali.
• Bahubali himself is worshipped, especially in the form of the gigantic monolithic statue, but the first Tirthankar pratima was created by Bharat.

References:

• "Jainism: The World of Conquerors" by Natubhai Shah
• "Jain Tirthankara Rishabhanatha" (Jain scriptures and traditions)