This is Kartikeya, son of Siva and Parvati.  Here Karthikeya has six faces and twelve arms and is riding his vahana, a peacock.

This image could be called Arumuga or Shanmukha (who has six faces), Dvadasakra (who has twelve arms), Dvadasaksha (who has twelve eyes), Mailerivelan (the lancer who is mounted on a peacock), Karthikeya (nursed by the six Karthikas, Pleiades) by virtue of the features. This is in addition to his other names, Andi, Saravana, Velayuda, Murugan, Skanda, Kandaswami, Tarakarjit, and Gangeyan.

The above paragraph is based on Iconography of Southern India  by G Jouveau-Dubreuil (English translation)

The story of his birth varies depending on the texts, the Puranas. But it is generally accepted that Siva’s energy was carried to Saravana Lake by Agni, and in that lake, six children were born. These children were nursed by the Karthika sisters. These six children were brought together as one child, as their mother, Parvati, wanted to hug all of them at the same time.

Each of the six faces is sculpted with care and has individual crowns, and it has a finial bringing all the crowns together. Compared to other bronzes, the ornament is sparse, just crown, necklaces, channivara, waist band, chest band and wrist bands. Ornaments like arm bands, shoulder hara and anklets are missing.

Each of his arms is holding distinct attributes, and they include Sakti, arrow, sword, discus, noose, bow, shield, conch, plough, and double vajra. His front arms are in abhaya (protection) and varada (boon-giving) mudra.

In this form, riding a peacock, Karthikeya is widely known all over India and these days his worship is more common in South India. He is known as a warrior god and is the commander-in-chief of Shiva’s army of devas. Hence the name Devasenapathi (Devas general).

The complexity of the piece and the quality of work is worth noting. Notice Karthikeya’s dhoti (lower garment) and the folds are cast in place rather than chiselled or incised after casting.

This bronze is about 12.5 cm in height and is most probably from Tamil Nadu. There is no ritual worship-related wear and deep patina. This may not date before the nineteenth century and may even be from the early twentieth century.