From what I have figured out till yet:
(everything listed here is fully tested and tried)
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King Harlaus of Swadia:
- Rarely joins the campaigns, even if he is free
- Always throws feasts in between of campaigns, and calls lords back to Praven if they are winning
- Mostly often seen patrolling around Praven, or going to newly captured fiefs to garrison them
- He is of 'half-serious and half-joyful' nature, as he has good relations with each lord
- He is very strong in combat, especially when he is mounted on his powerful Charger horse and Great Sword
- He is an offensive commander, but relies on defense when under attack
- He has mixed armies, which have the heaviest cavalry in Calradia and best armor available, and are of medium speed
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King Ragnar of Nords:
- Joins all of the campaigns
- Throws feasts at a normal rate, and all of the lords come to his feasts
- Mostly seen travelling from western to eastern borders of his kingdom
- He is of dangerous nature, and a tactical warrior (he knows when to fight and when to declare peace)
- He is very strong in combat, especially when he swings his War Axe
- Focuses on offense, particularly on Vaegirs and Swadians
- Somewhat slower, but stronger armies
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King Yaroglek of Vaegirs:
- Often joins the campaigns, particularly if they are against Khergits
- Rarely holds feasts, and focuses on war, mostly
- Seen patrolling around Rivacheg
- He has an extremely serious nature, and he is a genious who divides his power equally
- He has a nice strength, as he slashes his way into the combat with his Two-Handed Saber
- Focuses on defense rather than offensiveness
- Has medium-speed armies who can help each other while defending
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Sanjar Khan of Khergit Khanate:
- Always joins the campaigns
- Throws feasts often, and only when in peace
- Often seen resting in Tulga
- Has a good, and warlike nature
- He is excellent fighter, and uses his lance to maximize his strength
- Extremely offensive ruler, and wins nearly every battle easily against Swadians and especially Sarranids
- Has the fastest army in whole Calradia, he conquers Sarranids in a single day
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King Graveth of Rhodoks
- Joins campaigns rarely
- Throws feasts at medium rate, and all lords come to attend his feasts
- He is seen usually patrolling around Jelkala
- He is of unpredictable nature, and this thing surprises his enemies
- He is an excellent swordfighter, and slashes anything that comes to offend him in his own provinces
- He is a medium ruler, he controls his army in both defense and offense in the circumstances
- He has a good Pike, Spear and Crossbow armies, but lacks in cavalry, so his army is of somewhat slow speed
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Sultan Hakim of Sarranid Sultanate:
- Never joins campaigns
- Throws feasts at a great rate, but usually only half lords come to attend
- Rarely seen going anywhere, he always stays in Shariz and waits
- He is of serious nature, and implies a good power in his own city
- He is a nice lancer, and kills away any type of enemy
- He is a medium ruler, as he always focuses on a single target and hunts him down
- he has usually swift armies, but no one of them co-operates with each other