[quote=@BCTheEntity]
[@Halvtand] Holy shit. I really like that idea. I mean, the third option for increasing an android's power level would be "get a mechanic to increase your ki throughput directly", and I think one of the DBZ movies did a similar thing with the Super Android 13! movie, but it definitely works as a character concept. You'd best make that character, good sir. And now, in exchange for my feedback, can I ask you what you think of my idea regarding the Buu-like absorption ability for a Majin?
[/quote]

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.