God Eater 2

[Raimoo]

Sooo like is there any benefit on doing their respective episodes?

yeah you will unlock NPC ability to use Blood Arts, Blood Bullets and items such as stun gernade and healing items. It can even change the way they speak during battlefield. I dont know about Licca's character episode rewards tho. probably a better Link Support Device or something.

I can select the triangle button on some characters like Licca, I tried selecting all of the options on her dialogue but I can't progress anymore. Also, I can't seem to start any of the other character's story like Erina's.

New character story will unlock if:
- after certain story mission is completed
- you have done a number of mission with certain character

Also (I forgot to mention about this) sometimes you have to do mission (either story missions or free missions) with certain character normally. If you are in a mission selection menu, you will see the word "story" flickering on the right of the NPC's name during selection of NPC to join you. When you do mission with character that has that "story" word flickering, you will be able to access to thier cutscene before and after the normal mission.

maybe this google translated GE2 japanese wiki may help you understand how character episode got unlock.

Character Episode

Lastly, there's this "IMPORT SAVE DATA" on the starting screen of the game, what does it exactly do?

Import Save data lol. In other words, manage the save data either by reseting it or retain certain data.

the new update add the option to able change character looks without the need to restart the story mode of the game.