Word choice for 'please' when begging? Japanese _shockingly_ is really into politeness, and thus I've found a million different words for the English 'please'. But I must ask, what would be the best word/phrase to use when begging. Like when a child asks 'Please daddy don't go!', what is the Japanese equivalent to the English's emphasising word 'please'?

If you do need an equivalent, probably it's (casual) or (politer), but I think Japanese small children use this far less often. To their parents, they would usually say (a general-purpose attention-drawer word similar to "Hey" or "Come on"), or simply repeat the "don't go" part.