Welcome, galtzaiLe.
A general comment to start off about spellcasters, in addition to kmonster's excellent advice. I like to take two divine casters per party, and make one of them more battle-oriented. For example, a Cleric[x]/Fighter[1] (for the normal game - it can go up to Fighter[4] in HoF, if you choose) with max Str and Con as the battle cleric, and another divine caster with more "normal" stats to cast from the back. I construct characters in my parties as a unit, making sure they each cover a role and have the flexibility to cover more than one.
Here's some suggestions. Don't feel bound by them. There's plenty of other ways to construct characters and parties.
PC1 - stat distribution is fine, but I'd try to poach a couple of points from somewhere to maximize your starting Dex. It's worth another +1 to your ranged attack, all game. I'd use this character more as a "slasher" (e.g. in and out of combat, not standing and fighting), so I'd skip the armor. I'd also try to get 14 Int, for the skill points. You might want to just make this character a Rogue[x]/Fighter[4]. You can achieve the dual-wielding feats with feats from your fighter levels, and I'm not a big fan of taking one Barb level - Rage is useless once you have access to lvl 2 spells because it doesn't stack with Bull's Strength, and you could just take the Dash feat for the movement - so essentially you'd be trading one extra fighter level and 2 extra HP for weapon specialization.
PC2 - Make this one your "conventional" cleric caster. Dump the monk level unless you want to maximize the AC bonus by also maxing Dex and make this into your battle cleric. A conventional cleric should have at least 14+ Str and Con, max Wis, no more than 12 Dex, and whatever else you want. I'd recommend a pureclass cleric as your conventional caster, with maybe one other level (monk or fighter) if you absolutely must.
PC3 - As it is, this character is trying to fill a few roles, but won't fill any of them as well as it could. Start as a cleric, take a lvl of fighter fairly early, and max Str and Con. Three Barb levels will throw this character right off because of the XP penalties. Either take it as a human (so your favoured class can be Cleric), or skip the Barb levels and up the Fighter levels to 4. Talos, Tempus, and Helm are all good battle clerics. A battle cleric can be the main frontline fighter of your party, particularly if it's a dwarf (extra HP, good saves).
PC4 - kmonster said it all. About the only thing I'd do is distribute the stats differently. I'd go 8-14-14-14-8-18. I can do without the high Con, since I believe that I should set up every battle so my sorcs aren't targeted.
I like the good Int for skill points, as you will be distributing them between 5 skills (Concentration, Spellcraft, Bluff, Diplomacy, and Intimidate). If you need to, you could also take one other skill to take some of the identifying responsibilities off of another character (e.g. Alchemy).
PC5 - same as kmonster. High caster levels early are the keys to an easier normal game and the early stages of HoF. Save the multiclassing for later in HoF.
PC6 - bards are fine. If taking a bard, disregard my stat advice on the sorceror, increase the bard's Int (perhaps to 16) and make the bard your talker. I favour a Bard[11]/Wizard[x].
A character can't be a paladin and a barbarian. One must have a LG alignment, the other must be chaotic.
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