How Big Does a Black Hole Need to Be to Suck You Up?

There is no minimum size to a black hole that could eat hugo. Any black hole, no matter how small, would successfully eat up five year old child. The issues here are that really small black holes tend to evaporate. If you create the black hole and leave it by itself for a little while before you feed it, then it might evaporate before you get back to it. So it wouldn't evaporate a faster than it could maybe absorp some of the mass from hugo.