They vary greatly in size and ability. Some are very slow, some are very fast. I haven't seen any use any form of Sonido--or...Sh-Shunpo? Is that what you call it? But they are a threat none-the-less.

In most cases, you should aim for either the head or chest cavity, if you can discern where it is. I'm not sure if they like to eat Shinigami, but they are very fond of Hollows.