You're awesome, Fenberry, thanks for your help! The only thing keeping me from really enjoying this game is that I don't fully understand the mechanics. I probably never would've known about the Accel-Heat thing if one of the bonus conditions wasn't "Don't use Accel-Heat".
BTW, I watch a ton of your videos on youtube (although my username is SverigeHobbes there - I've never stayed consistent). I especially like the Unlimited Cruise ones because I never got to play the game.
My esteemed pleasure, my friend. Always happy to help. I love all the Grand Battle style games, and have taken great lengths to get down to all the extra little things about the characters, specials and gameplay.
In all the Grand Battle games, characters don't have super armour when they do a super attack, whereas in Unlimited Cruise they get super armour (ie don't flinch when attacked during their super attack).
You can hold block and dash towards your enemy to close the gap, and followup with a grab if they block - In grand battle 3 and Rush, you can dash into a box and if this flying box hits the enemy, they will be dazed for a couple of seconds
In Grand Adventure, you can swing the box by pressing the heavy attack button (X on the gamecube controller) to swing it - same deal, dazes the enemy.
If you block right at the moment an attack will hit you (including a super attack…but obviously not an attack which in unblockable), you'll do a 'bingo block', you'll flash for a brief half a second and get some special meter filled... the only way to bust out flashy moves when you turn item boxes off.
The crystal item from Grand Battle Rush could be used to summon supports which were unblockable, but this item and this effect were removed from Grand Adventure.
You can have Tashigi with Tashigi support, and Zeff with Zeff support - highly confusing.
Jumping on an enemies head spits out coins from them for you to collect - Nami's first Super Attack does this much better.
Other general mechanics are the rock scissor paper system of the secret attacks - It goes clockwise, can't remember where they are on screen from memory - if your at critical health, and you enemy has a fair amount of health more than you (and if you win the rock-paper-scissors), you'll do about 50-80% of their full health bar in damage - pretty awesome.
Zeff's secret attack is just silly.
Several characters attacks can be held for more power - Luffy's Gomu Gomu no Axe can be held indefinitely until he uses it or gets hit by something.
Patty fries up some awesome grill
In Story mode, use each support in a battle 3 times to unlock them for vs mode (doesn't need to be called during the match, just selected and you beat the enemy) - this applies even for battles you have already played, so just go back to the first island you started on and beat it 3 times with your chosen support.
You'll unlock all support characters, accessories and stages if you complete all the extra conditions of the match.
Each strawhat has 3 Super Attacks, instead of 2 from Rush
There are three stages (at least) which can never be unlocked. The Alabasta sand one you play in rumble battles in story mode, The Going Merry, which you sometimes fight the Strawhats on during Usopp's Pirate Panic, and the Flying Mode Going Merry (inlcuding wings), which you fight during 1 battle only I remember against Ohm in Skypiea in Luffy's story mode I think... Really want to play it vs mode, not able to unlock it though.
Accel Heat is pretty nifty, and can get a bit crazy in heated matches, especially against 'Smoke-strike' spamming Smoker CPU's... Use it well. I don't think too many super attacks can be chained this way, but experiment.
Usopp's Impact I think changed between Rush and Grand Adventure, you used to be able to pull it out by pressing L+ ligh attack, jump - absorb a few attacks, then bust it out at point blank range - Grand Adventure changed it to get pulled out - absorb things for about a second and half, then blasts it out - haven't been able to use it like I used to.
Edit: thanks for liking my videos - now I am able to upload from work, should see regular updates... Unlimited Cruise is so much fun...can't wait for SP. Cheers for the support~!