Ok for Fighter guide as follows :
For the character itself, focus on Agility, Hit, Crit. Dodge is also nice stat to have later on.
For the Heroes, it depends, if u want to excel in PvP then 2 tanks is for u, else 1 tank is enough.
For the beast, choose beast that increase the above stat or the attack stats ( Chimeira )
To improve your char, try upgrade goddess, maximize mount upgrade, maximize the Begin skill to 20, and get good ornaments, forge orange gear and later to red gear. Improve vestment is just do one
To improve your heroes, try to get at least an orange title ( or red title for red heroes ) and maximize first the demonization, then the aptitude, maximize totem ( mostly;tanker get hp/def and nuker get hp/matk ), also put good mask, ring and talisman for them ( get via hell 6/7/8 )
To improve your beast, go for bout III as fast as possible