Trained on animefull, contains 3 outfits:
Academy appearance: defHubert, white gloves, hair over one eye, long sleeves, boots, garreg mach monastery uniform
add "weapon, sword, sheath" to try and get his sword. It probably won't turn out that well though.
Three Hopes appearance: hopesHubert, armor, gloves, cape, shaggy hair, hair over one eye
If you want Hubert alone in this one, "solo" is strongly encouraged. Otherwise knock-off Monicas or Edelgards may appear.
War appearance: warHubert, cape, armor, short hair, hair over one eye, white gloves, long sleeves
Adding "two-tone hair" may help with consistency, it was in a lot of the training data. Hair for this outfit isn't super accurate.
Weight: 0.8-1.0
Bonus: a lot of the training data contains other characters, so some other FE3H characters might show up for free. For example, adding "1girl, edelgard von hresvelg" could add in Edelgard. And it will probably make her super short, which is pretty funny.