there would be possible 10,000 diferent killis
We have about 25 to 30 here in NZ but more turn up from time to time
As with most fish, the larger see the smaller as food so larger types would not be advised with things like neons.
Fish like Striatum, Australe and Biteatiatum (I know the spelling will be wrong on that but as Im at work, I dont have my books here) should be fine. One would not be advisable as you simply would not see it but a few should hang out together and be fine.
Killi fish are no more agressive than other fish that will eat live food. What gives them a bad rap is the name
Most are jumpers so you need a covered tank and to have the lid tight fitting but in saying that, I doupt that I would loose more than 2 or 3 per year total from all my tanks.