I'd probably suggest Libra as well. Henry and Libra both give Inigo Dark Mage, which is all he really needs to be a good lead (Vantage/Vengeance setups, or Lifetaker to help him as a sweeper if you pass him Galeforce from Olivia). Henry only also gives Thief (Trickster skills are pretty all right, but Assassin is really underwhelming) and marginally better mods (1 more than Libra in Strength, Skill, and Defense). Libra, on the other hand, gives Priest (Renewal is a really useful skill to have for nostanking setups IMO, and Tomefaire helps if you want to run him as a Sorcerer). Both fathers are probably more useful elsewhere, though.