You posted in the wrong subforum xD. This is the Toram section and this is an Iruna question. This would be better posted in the Tips and Tricks section of Iruna since it's not for Gladiator or Paladin specifically. Gonna tag Raikumi the Toram mod and she will probably move it
I'll explain in general what they are about real quick:
Gladiator:Pretty Tanky DPS. Mostly DPS though not a true tank. If you want to be a damage dealer look to this guy
Beast Knight: In between Paladin and Gladiator in their tankiness. Closer to a true tank than a DPS. This class is incomplete as it was recently implemented.
Paladin: Pretty much pure tank. If you like seeing massive HP numbers this is your guy lol. Tied with Enchanter as best tank(was the only best tank for the longest time though).
If you want to Hunter you will be a pure DPS and it's a long hard road.
The build you want to do will differ depending on the class as almost all of those have different stat builds xD. In general though, Asobimo(the creator of Iruna) doesn't cater to balanced stat builds. So you basically stick to only 2 stats for a very long time and later add on a 3rd. Only 2 classes I can think of do 4 different stats(Enchanters and Hwiz). For leveling most would recommend an AGI CRT build for a while while using claws, this requires you to reset your stats later on though which costs real money(gotta buy $10 worth of coins).
ManaKhe- Lvl 285-300 Enchanter(gotta get dat Mblade and Stoneskin) ManaSel- Lvl 240ish Monk ManaLock- Lvl 147 Servant