Adventurer class was very very very important back then than now. If you have FF full vs full, you need them to block sectors or towers, they can easily help you to win, since they were made to block sectors, not to do dmg or dodge at all. But, as we have noticed [ probably], this game usually cant keep full forst for longer then 6 months on new servers, and from then, every world 2 years old and older is lucky to have 20 vs 20. Meaning nowdays adventurer is useless. On older worlds you need to dodge instead of blocking sectors to be honest. what I would recommend for adventurer:
Adventurer:
1. Drop chance for product and from jobs 25%/50%
2. Luck 25%/50%
3. Sleeping free in all hotels 1-5, regeneration 25%/50% faster
4. In Fort Fights, resistance 25%/50% more if alone in sector. I would keep ghosting as well.
5. In Duels, bonus 15%/30% dodge if attacked.
Builder:
1. XP from jobs, duels and FF 15%/30%
2. In duels if attacked, bonus 20%/40% dodge
3. In Fort Fights, Bonus 25%/50% dodge, 15%/30% aiming
4. Duel protection during building city buildings [expect church].
5. From jobs 10%/20% less injury
Dueler:
1. Speed on map 40%/80%
2. You can see dueling skills other players
3. Regeneration 50%/100%
4. In duels if attacking, bonus 25%/50% appearance
5. During Fort Fights, 10%/20% chance to crit IF on duel tower. Otherwise 5%-10%.
Soldier:
1. HP skill bonus the same, for each skill point given to the healts x5
2. In Duels, bonus 15%/30% to tactic
3. HP regeneration 75%/150% if sleeping
4. In Fort Fights, leadership bonus ONLY to neighbours 30%/60%
5. In Fort Fight, 50% of you skills added to hp turnes as resistance
This way should all 4 characters be somehow balanced in their own area plus extra from the rest.