The Blessing and/or Curse of Mercury?
Mercury was the God of communication, hence Good Teacher or incomprehensible. Possibly cursed guile
The Blessing and/or Curse of Mars?
There are a large number of combat virtues and flaws which could fit this bill
The Blessing and/or Curse of Jupiter?
Born leader/difficult underlings (Jupiter is the Leader of the Gods)
The Blessing and/or Curse of Saturn?
Saturn is a Titan, not a God, who previously occupied the position of Jupiter, and who was celebrated midwinter as a Jovial retired King figure. As such he doesn't really fit the question, but if pressed carefree.
Going a little further afield, what about:
The Blessing and/or Curse of Sol?
Sol was a later Roman deity not only associated with the sun but with leadership, so like Jupiter born leader/difficult underlings. Appollo would be prophecy and be visions or premonitions.
The Blessing and/or Curse of Luna?
Lycanthrope would be an obvious curse, her blesings tended to be more varied.
The Blessing and/or Curse of Diana?
shapechanger/lycanthrope - as goddess of the hunt and virgin she was known to change men into animals
The Blessing and/or Curse of Juno?
True love/lost love as she was the goddess of marriage.
(Note that Diana and Juno are both associated with the Moon, thus their inclusion.)
And if we want to be a bit anachronistic, how about:
The Blessing and/or Curse of Caelus?
Which version? Caelus was a short lived Roman deity (appearing after Christianity) which took on many aspects during his short existence which are very distinct from one another.
The Blessing and/or Curse of Neptune?
As God of the seas, perfect balance for a blessing, motion sickness for curse
The Blessing and/or Curse of Pluto?
Wealthy/poor
The Blessing and/or Curse of Ceres?
Large/obese
The Blessing and/or Curse of Discordia?
Magical air/gentle gift