Unicorns were wiped out in the Lemurian war.
Professor Maxwell is a Time Lord, perhaps even the Doctor himself.
He is a wise and eccentric Deadpan Snarker and Half-Human Hybrid with an accent from the British Isles (Irish instead of the usual English) and is responsible for a facility which is Bigger on the Inside. Go figure. Imogen is a lesbian and was infatuated with Orla before she framed her for stealing the Orb of Lemuria.
She has the stereotypical look (short hair with tomboy clothes). She has demonstrated no interest in any boys (one is her brother, while Peter greatly annoys her). Her admiration for Orla may go beyond merely looking up to a role model. This GIF from 1x16
◊ shows her interest and that she is quite pleased to be simply acknowledged by her even non-verbally.]]