[quote=@Halvtand]
<Snipped quote by BCTheEntity>

Of course, and thank you for the feedback. I'll check out that movie and see if I can pick anything up.
This this technique isn't one of my favourite parts about DBZ it does seem to be an important part of Majin Buu's character and should've been passed on to his children. 
As I remember from the series the technique itself did not require a lot of preparation, but as you yourself states, it is potentially very broken. With that in mind I would probably bump it up to a level three even though the description for level two seems a bit closer to the anime. I would add an extra limiter in that another player must accept to be "hit" because it can completely devastate the character otherwise, and those things never end well. To push it up to level four is in my opinion too much as it would make the technique potentially unusable, the whole point is that it comes as a surprise. If you have to stand around and chant "chocolate beam" for a while it will spoil the effect.
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To be fair, you kind of have to be able to turn into a liquid form to use absorption in that manner at all, since otherwise, you're just kind of... awkwardly pressing yourself up against the target. As for the Chocolate Beam, that struck me as being magic-based rather than ki-based, given that what it did was pretty far beyond anything ki had been shown to do before then, and it (un)fortunately doesn't look like it has a parallel in the mystic techniques listed. But yes, trying to absorb other PCs should probably be something the players agree upon before it goes down in character, not least because at least one variant of it pretty much permanently kills them unless somebody pulls a Vegito to rescue them; I might also suggest, given how it's likely that even the combined power of every single member of the Majin race would be utterly insignificant to the original Buu, that perhaps attempting to absorb somebody far stronger than the Majin itself would lead to severe personality warping even if they then spit the target back out in the manner I described, resulting in a personality shift that could probably only be reverted by some pretty powerful magic.