Lacking anything better do to, I decided to try this one out as my first speedrun attempt. I got it finished more or less, link below.
http://koti.mbnet.fi/~gale/uploads/rs-dbaa.zip
As stated, it's the first one I've ever attempted, so bear that in mind. Obviously critique is appreciated if people have any inside knowledge on this so-far obscure game with a nametag that might turn away some people.
Some notes:
-Doing 1-frame jumps cancels most of the recovery for ground attacks, and keeps you moving, so obviously it's used quite a bit. Also, if you jump at an exact frame you land from a running jump (there won't be a cloud of dust to signify a landing as normal), you retain running momentum even if you turn around, allowing you to save some frames whenever you jump in platform-heavy sections where you don't have to fight any enemies.
-The "rush" special attack serves as an useful way to change directions while keeping you moving at a decent speed while also ignoring momentum. The reason it's not used more often is because it can't be cancelled out of and there can't be any enemies in its path or the actual attack is triggered.
-I chose to collect both optional Ki upgrades to be able to spam the rush special attack on bosses as much as possible, as well as being able to do high-leveled Ki blasts in VS fights, as those do the most damage.
-The dive kick seems to be the fastest way to move, but each kick has around 6 frames of startup lag. If used at a height where it won't be cut short and if it doesn't connect with any enemies, it seems to break even, though.
-As seen many times in the movie, the best way to rack up insane hitcounts and score multipliers as well as killing all human bosses in one combo and rapidly damaging mech bosses is to use what I call Dive Kick Infinite Of Doom, which involves hitting a (preferably airborne) enemy with a dive kick, cancelling that into the upward kick, cancelling that into dive kick, and repeating as long as the enemy doesn't drop low enough to touch the ground. What's interesting is that doing this combo repeatedly actually lets you gain height, which means its use is only limited by what height the enemy is at when you connect with the first knockdown hit (which occurs either when a grounded enemy dies or a grounded human boss gets hit enough times in a row)
-Obviously running is the main methoid of movement, as running speed carries over to jumps, and the running elbow attack can be used to start ground chains and kill enemies faster.