In the crossover twists thread, I made a comment on the topic of magical boys, as opposed to the traditional anime mainstay of magical girls. Some comments on how many of these there are and who qualifies arose. To prevent that thread from going off topic any longer, I am starting this one.
I am defining a magical boy as:
1: Male. Must be able to pass as human (This is not the same as being human). Preferably under the age of 20 (Though some of the older people might have qualified absolutely when they were younger).
2: Have some kind of magical/paranormal ability. The ability does not have to be innate to the character, it can be imbued in some artifact that the character possesses, such as a kakugane (Buso Renkin), a device (Nanoha), or a pactio card (Negima). Giant robots do not count as an artifact, though giant robots that are conjured by a paranormal artifact, such as Shosei Sakagauchi's Buster Baron (Buso Renkin), do.
3: The character must be willing to use that ability on behalf of others outside of their immediate family and social circle. This action does not have to be done in a way that is noticed by those acted on behalf of (Saving the world before anyone else knows that it is in danger is still saving the world, even if nobody thanks you for it). Preemptively acting to ensure that a threat never reaches the point where it can bring harm is just as valid as dealing with the threat after it appears. Situations where the action is done on behalf of a group which includes relatives and friends but is not exclusively (or primarily) in that category do qualify.
In the case of the Ranma cast, a lot of the NWC qualify for points one and two (Jusenkyo curses count, as does ki), but the question is on point three.