[quote=@BCTheEntity]
3. I mean... when I say absurd, I mean really a whole hell of a lot of power is gained from Namekian fusion. Nail had a power level of 42000, and Piccolo presumably didn't have much more than that, if he wasn't in fact weaker; yet their fused state escalated Piccolo's power level to more than a million, most likely at least 1.2 million or so given the difference between how he does in his fights against Frieza's second and third forms. Even if we assume that Piccolo miraculously reached a PL of 58000 from his sub-Nappa strength prior to death whilst training with King Kai to round off the combined PL of him and Nail to 100000, that's still a twelve times multiplier on that amount of power, minimum, and it's far more likely that their combined PL was closer to 50000, requiring a multiplier of [i]twenty four times[/i] to reach the 1.2 million minimum (lets assume the PL of fusing Namekians is added together prior to the multiplier itself), and probably twenty five times if we assume both the initial combined PL and the fusion multiplier are relatively round numbers. Piccolo's fusion with Kami was presumably a less dramatic boost than that, but given how much weaker Kami was than Piccolo at that stage, and the fact that Piccolo was already a fused being (suggesting reduced potential in future fusions), it'd still have been pretty impressive. Long story short, even the lowest possible combined PL between Harkon and Limic, 950, would likely have resulted in a PL of just under 24000, and the higher number of 1150 would have given even more than that, nearly [i]29000.[/i] In short, Harkon's far too weak for a fused Namekian.[/quote]

This is really interesting, and I think your calculations are logical. That big flaw here is that we don't know Piccolos power level pre-fusion. The latest number we have is around 3500 while fighting Nappa, which must have changed otherwise: [url]https://www.youtube.com/watch?v=BsMSiVn6vpQ[/url]
In my search for a reasonable power level for Piccolo pre-fusion I found one thing that is slightly more reliable than the thoughts of mr random internet person who once saw an animu. A published RPG with the DBZ logo on it. Granted, this was before people cared much about the integrity of IPs, but at least it's something. link: [url]http://dragonball.wikia.com/wiki/Dragon_Ball_Z:_The_Anime_Adventure_Game[/url]
This list states that Piccolo's power after training with King Kai is 800,000. Nail at 42,000. Post-fusion 1,200,000. 
With these numbers as a base the power increase was less than 50%, which makes Harkon's and Limac's fusion much more reasonable. 
This is of course with the assumption that the power increase is made with a set multiplier instead of with an accumulative scale.

Anyway. I don't think there will ever be a solid right answer to this. In the end the fusion is simply a plot device and the power level of Harkon is set pretty low because I don't want this character to be the big and powerful dude that he might be if all rules were followed to the letter. If it bothers you, we can write something about it in-game after he's had a big power surge, something about the corruption holding back his true power or something like that. 

[quote=@BCTheEntity]4. ...I mean, maybe? I'm just saying, one clean hit with even a single shuriken could probably take any human-sized target's head off, and it doesn't seem like it takes much time to create one. I'd have figured the actual difficulty in the technique isn't in the amount of ki you put in, but in the way it's spun to form a razor edge, presumably with most of the disc's ki focused at that edge, which is why they're always made to be so large in canon - you may as well make it as likely to hit as you can get, especially since the disc always seem to be going at a fair clip (not the Final Flash's "across the galaxy and blowing up a distant planet in a few seconds" fast, but not overly slow either), and since one can figure out ways of telekinetically manipulating any given disc.[/quote]

I agree with this whole quote, and when this character is facing Mooks or other unimportant NPC's this will be a pretty devastating technique. But the important thing is that mooks are mooks for a reason, they're pretty much just filler. When the real fighting begins (against other players or GM-controlled enemies) I expect everything to be dealt with in a more lore-friendly way. What's important is that the story we write is interesting and fun. I'm not after a "always kill"-attack, I just think the destructo-disc is cool as hell and wanted to make a character that has it as a theme. 

[quote=@BCTheEntity]5. Maybe Guru's powerup unlocked Dende's native potential for [i]magic,[/i] and Healing just happened to be the field he was naturally skilled in. Maybe his potential unlocking ability had two different types, with the magic type only working on beings with the potential for magic, i.e. not most humans or Saiyans, and certainly not those with a generally martial inclination. Or it just changes what it does depending on what significant potential it senses within any given being. My point is, there's a few possible reasons why Dende suddenly acquired healing abilities, and since he didn't show any potential in ki usage either before then, I have trouble imagining that he had "special ki" which needed its potential unlocking when there's clearly a precedent for magical healing, both in-series and in this game.
[/quote]

I see your point, the only thing I can correct here is that Dende did show that he could manipulate ki by flying. Other than that I have to agree, we have no idea how Guru's unlocking actually works, it could be any of these things or fifty others. I can't really argue here.
I think I'll leave this up to the GM. If necessary I will change the healing to a mystic art and write some shit about it.