Arastoo Vaziri (Season 4–) is a lab assistant first appearing in the episode "The Salt in the Wounds".
Originating from Iran, he is a devout Muslim and prays five times a day.
Expecting others would find it odd that he is both a scientist and very religious (a suspicion his co-workers later confirmed), Vaziri decides to put on a false accent to sound "fresh off the boat" and thus make his religious devotion seem like an irrelevant byproduct of his heritage.
In the fourth-season finale, Arastoo was re-imagined as a potential buyer of Booth and Brennan's night club. It’s a privilege to be able to serve this victim, to show him the care and love that was so absent that day.” Arastoo is often the opposite of Bones (and similar to Angela, another artist) in investing the victim with humanity at all stages, and feeling empathy for their plight, as in "The Survivor in the Soap" or "The Signs in the Silence" (Which saw the team deal with 'live' evidence in the form of teenage abuse victim Amy Shenfield, Arastoo being particularly moved when X-rays revealed the extent of abuse Amy had been subjected to).
Arastoo shows a high level of proficiency with nunchaku whilst assisting Hodgins in an experiment, and in his first appearance speaks of the 'quips' he endured from "the First Battalion, 9th Marine Regmient, Regimental Combat Team One" in a manner which suggests that he himself was a member. Those horrible men who hijacked those planes hijacked my religion that day, too. In The Bod in the Pod it is discovered that he writes poetry in Farsi and at least one of the poems is dedicated to Cam.
It's quite possible that Arastoo is multi-lingual, speaking Persian, Arabic, and English.