1st row, characters that are used every day (life skiller and combat)
2nd row, characters that stay in World Bosses (Nover, Kutum, Karanda, Kzarka, Offin, Garmoth)
3rd row, characters that stay in LoML World Bosses (Sangoon, Uturi, Golden Pig, Bulgasal)
The rest are free characters used for events roaming