Viramamunivar also reformed the existing two short and two long vowels, which existed at the time, to their current form. His reform of Tamil scripts is praised even now for its utility. Other than composing the Tempavani, Joseph Beschi wrote other literary works in Tamil language including the Tirukkavalur Kalampakam and the Kitteriyammal Ammanai. Tonnia Vilakkam, a grammatical work composed by the author, is considered as the one of the most significant works and thus several established scholars have renamed the work as the Kuttit Tolkappiam, after the famous grammatical work Tolkappiyam. Further more, the Tamil Christian poet Viramamunivar analysed the differences between spoken and literary Tamil and composed two different grammatical works titled Kotuntamil Illakkanam and Centamil Ilakkanam respectively. He also translated the Tirukkural and the Tonnul Vilakkam into Latin.
The Italian poet and author also composed some prose works in Tamil language. Paramartta Kuruvin Katai, a humorous composition, is perhaps the most popular works among them. It is a compilation of amusing and funny short stories that were written much before the appearance of short story as a genre in Tamil literature. Viramamunivar constructed a book of ethics known as Vetiyar Olukkam, for the seminaries. It was translated into both Kannada and Telugu. Amongst the other major works in prose written by Joseph Beschi or Viramamunivar, the most noteworthy are Petamaruttal, Veto Vilakkam and Nanak Kannati. Among them the Nanak Kannati was rendered into Kannada.
The epic work of Tempavani elaborately describes the many tales which are related to the life of Lord Jesus Christ together with other traditional accounts, composed in 3615 verses. The Tempavani contains many lines and phrases which are found in the works of Kambaramayanam and Tirukkural and he followed the convention of epic works in Tamil literature such as the Kambaramayanam and the Periya Puranam.