Here are some concepts of minor Hedge magi that may be enlisted by House Tremere, with suggested virtues and flaws.
Faerie Messiah
Her mom claims she was a virgin, having been visited by an angel clothed in light. Whether by accident or design, this faerie-blooded child is unusually appealing to Faeries, who regards her as the harbinger of some greater destiny.
Virtues: Faerie God Blood, Faerie Sympathy (Faeries), Alluring to Faerie Beings, Familiarity with the Fae, Faerie Background
Flaws: Faerie Sympathy (Religious Symbol), Faerie Heritage
Mistress of Vermin
Always surrounded by vermin, this filthy sorceress is more at ease among rats than humans. Despite this, she is an asset to the house, since her "friends" can be stealthy spies and messengers. And of course, being attacked by a horde of rats is sure to faze even the most hardened warriors.
Virtues: Summon Animals (Rats), Animal Ken
If the troupe allows it, a more efficient version can be created using Command Animals (rats) from Rop:tI
Flaws: Social Handicap (Filthy), Lesser Malediction (Surrounded by vermin), Monstrous Blood (Animal)
Pagan Priest
The last priest of a local god or spirit, you know the proper rites with which to ask it to use its powers for you. You hope to revive its cult, or maybe find out fellow worshippers.
Virtues: Faerie Friend (insubstantial), Wise one, Inspirational, Puissant Faerie Lore, (Faerie) Folk Magic (TSE p123).
Alternatively, Magic (spirit) companion can be substituted, but in Arm5, this doesn't really fit a priestly role.
Flaws: Pagan (Bit of caution, since I've seen it been misused: You don't need this to be a pagan), Delusions (about your god's real power), Enemies (Any other god's priests, but Christians are probably more appropriate)
Seer
Blessed or cursed with visions of the past, present or future, seeing too much for her own good
Virtues: Intuition, Premonitions, Geomancy (BS&S p111), Wise One
Flaws: Visions, Plagued by Supernatural Entity
Speaker to the Dead
He sees dead people. They see him, too. A veritable beacon to the restless dead, he'll quickly attract a host of ghosts wherever he is, some ready to help, most just pestering him with their demands.
Virtues: Social Contacts (Ghosts), Second Sight, Alluring to Magical Beings
Flaws: Supernatural Nuisance (Ghosts)