Ṛṣika (Rishika) is a rājarṣi (rajarshi; king with the attributes of a seer-sage). In the previous kalpa he was a dānava (danava; demon) called Arka.

Mahābhārata (Kinjawadekar)(1.67.32-33)
Mahābhārata Vols. 1-43 (Siddhāntabāgīśa)(1.62.33.)