Some imports to mention:
J-Stars Victory Vs- PS3/PS Vita- Fighting game of popular shonen characters
Sword Art Online- The only way to get a physical copy of this is getting the Chinese version of the game, which has a English translation.
DENGEKI BUNKO: FIGHTING CLIMAX- another fighting game that you also get for a ps3 import as well
bullet girls- a weird shooting game with a lot of fanservice, easy game to pick up
soul sacrifice delta- interesting action game with a asian version with an engish translation.
To be honest, the vita is a system with a ton of jrpgs, and very few english translations within those games due to the motivations of the developers. If you really want to get into the vita's import library and explore its catalog more, you will most likely need to learn some Japanese so that you can understand and play through those games.
Also, you may find more vita games with english translations in asian versions of game, and just look for genres that traditionally don't have much text.