Short answers, pulled from the story.
Lokaksema was a Kushan Buddhist monk of Yuezhi ethnicity who flourished between 147 and 189 CE. He is regarded as one of the first known translators of Mahayana Buddhist texts into any language, producing his translations in the Han capital Luoyang during the later Han dynasty.
The Taishō Tripitaka attributes twelve texts to Lokaksema. Scholars consider eight of these reasonably certain, including a translation of the Astasahasrika Prajnaparamita Sutra, the Scripture on the Tusita Heaven, the Pratyutpanna Samadhi Sutra, and the Ajatasatru Kaukrtya Vinodana Sutra.
Lokaksema was of Yuezhi ethnicity, traditionally described as a Kushan from a region spanning modern Iran, Afghanistan, and Pakistan. Scholar Paul Harrison has speculated that his mother tongue was Bactrian, and he was very likely also familiar with Gandhari Prakrit.
Lokaksema extensively transliterated Indic terms rather than rendering them into Chinese equivalents, and retained the long-sentence style of Indian originals. He converted Indic verse into Chinese prose without attempting to capture the meter.
The primary biographical source is a short account by the monk Sengyou, who lived from 445 to 518 CE, in his text Collected Records concerning the Tripitaka. Sengyou's work also confirms that at least one of Lokaksema's translations, the Shoulengyan jing, was already lost by his time.
Lokaksema arrived in the Han capital Luoyang toward the end of the reign of Emperor Huan of Han, who ruled from 147 to 168 CE. He translated texts between 178 and 189 CE, but after the fall of the Han dynasty he disappeared from the historical record and the date of his death is unknown.