I've been having a ball toying around with Lu Xun just now.
Found an easy 60-90 hit combo setup. Twin Swords C3 -> Ex -> Bow Switch -> S-String -> Musou -> Bow Juggles.
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Edit:
I just discovered something weird about the stat system. I was keeping track of my Sun Quan's stats in the final Wu stage, it was 568 Health, 717 Attack and 641 Defense. When I went into Chronicle Mode I checked my Sun Quan to spend my Bukou on my Skill Tree and realized my stats were: 348 Health, 441 Attack and 411 Defense.
So it seems that stats in KM are set by stage (to keep the difficulty from going too crazy I suppose). I suppose you should still carry over the upgrades you pick up from officers, but I haven't been able to test that yet. I'll look into it tomorrow. I do know that Gold and Bukou carry over from KM to CM, so Stat drops SHOULD too.
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Edit 2: I just did the first 4 stages of Shu's story mode and now I think I understand how the stat system works for KM. Basically any Health, Attack, Defense or Bukou that you earn in the mode gets treated as being earned by the whole kingdom, while in the story mode. While whatever stat drops you pick up by a SPECIFIC character and your total Bukou at the end of the stage gets earned permanently by that character.
This should make things understandable:
My Zhang Fei stats before starting Shu's story:
Health 298 - Attack 301 - Defense 283 - Bukou 154.
While playing the first four stages (two with Liu Bei and two with Guan Yu) I picked up a total of:
Health + 30, Attack + 27, Defense + 26 and Bukou + 776.
Thus, upon starting the fifth stage Zhang Fei's stats were:
Health 328 - Attack 328 - Defense 309 - Bukou 930.
Now the confusing part is showing what actually gets carried over permanently into your character. So lets say I played the 5th stage and Zhang Fei got Health +10, Attack + 4, Defense + 7 and Bukou + 126 throughout the stage.
Zhang Fei's stats in KM at the end of the stage are:
Health 338 - Attack 332 - Defense 316 - Bukou 1056.
Whereas Zhang Fei's REAL stats - when I check them in Chronicle Mode - are:
Health 308 - Attack 305 - Defense 290 - Bukou 1056.
I hope this makes sense to everyone, I was confused for a bit while trying to figure it all out. It is also late so I may not be explaining this in the best way possible