Now bear with me, as this is all theory and conjecture, but here it goes:
Nodregah does have a point. As already stated earlier in this thread, if I recall correctly, the only way to have a crossover between Ranma and Dragon Ball is to alter the rules each universe operates on. Which one is altered depends on the basis for the crossover. For example: You are doing a Ranma -> DBZ crossover. Since you are merging the Ranma universe into the Dragon Ball universe, the rules change to the core Dragon Ball rules with a smattering of Ranma rules (like Jusenkyo) thrown in. Therefore all the Ranma characters now follow the same rules as the Dragon Ball cast. Basing on visible activity levels, Roshi is a couch potato while Happosai seems to be constantly on the move. Therefore Happosai could possibly be even more powerful than Roshi (based off anime 300+ years Happosai age, so as to match Roshi’s age). Ranma has as much if not more potential for power as Kururin* (the highest human power level, both in the manga/anime and in guess-work lists), since he would likely be constantly training with his own skill thrown on top of that. So with that in mind, Ranma has the potential to eventually exceed Frieza’s 3rd-form power level, possibly even match early 4th-form power levels**; though not without heavy training, time, and some good old dues-ex-machina. In terms of the Neko-Ken, it may act like a temporary, limited power boost, putting Ranma at the lower-end Saiyan’s level in terms of speed and power, but not abilities (since Neko-Ranma has never displayed any of Ranma’s techniques to my knowledge).
Now, if you want to play it as “Ranma the Saiyan”, then all previous bets are off. Ranma now only has the power boundaries that Goku and Vegeta display (as in, none). Though one way to preserve a level of drama and interest in the story is to level out Ranma’s skill + power vs. other Saiyan’s power, possibly in the form of some limitation. Such as: because of trauma from the Neko-Ken, Ranma can’t maintain SS forms without difficulty. Or some such plot point. Too many authors slap post-Saffron Ranma skill with SS Goku levels of power and make a boring “Ranma Ueber Allen”*** story.
On the other side of the coin, you have to Dragon Ball -> Ranma crossover. As with earlier, whichever universe is entering which MUST change its core rules to fit those of the established universe. If the Dragon Ball universe were to translate into Ranmaverse terms, the most major change would be the almost complete power lobotomy. Here we have Super Saiyans only capable of destroying city blocks instead of worlds. Gohan’s power level of 700 from the beginning of the series would Freiza’s maximum power. 1,500 would now be SS2 Gohan at maximum strength. Nappa’s 4,000? Kid Buu’s level now. Furthermore, to fit in with the confines of the Ranmaverse, the Z-fighters would have to be a lot more physical than previously, since now they don’t have nigh-unlimited amounts of Ki to throw around. This also means that some things, like Goku’s teleportation technique, would have to be explained away as magic, since the characters no longer possess the levels of Ki necessary to perform such feats. Flying at supersonic speeds? Not happening. Blow up the moon? Maybe Kid Buu can, maybe.
The early Dragon Ball power levels seem to be a good place to start since Roshi, the strongest human up until post-Raditz, has a power level of only 139, it can be said that Cologne and Happosai would be around that level, with the other characters varying dependant on that. The average human in DB seems to be around a 5 in terms of power, with the average martial artist being anywhere from 5-20. The more advanced fighters (Akane, Yamcha, etc.) run anywhere from 20-100 (Chi-Chi rates in at 73, so I’d put Akane around that level). Only the really exceptional fighters (Ranma, Goku) seem to rise above that 100 mark. However, that’s just beginning levels. We see later on that such levels would have to be surpassed, though I would be reluctant to allow un-transformed characters to reach higher than 600 (that means you Kururin and Human-Ranma).
Notes:
*}
Numbers from one of the two lists that seem to be on every DBZ site. Other list puts SS Goku’s power level during Namek saga at ~3,000,000. I used the larger set because of the “Oh Crap” factor the greater variance in the numbers possesses.
**}
Kururin’s power level is ~2,300,000 (as of World Tournament-Buu Saga). His power level is most likely lower than during Cell Saga since he spent the last few years lounging on a beach. Using the same percentage of power lost as Gohan, Kururin’s Cell Games power level comes out to ~2,760,000. Highest listed power level comes in at ~3,000,000, just before his death at the hands of Super Android 17.
***}
German phrase. “Ueber allen” translates to “above all”. Often confused with “ueber alles”, which means “more than anything else”. “Ueber allen” refers to Ranma always winning, always being better than the rest of the cast.
Sources:
Power Level List – high
http://www.myfavoritegames.com/dbz/power-levels(new).htmPower Level List – low
http://gohan_2002.tripod.com/DragonBallZPlatnium/id12.html
