That's why, read when you have time. The list I have read is on my signature. If you really don't have time, maybe we could make it so that your world is only connected to some other worlds. (If this sounds confusing -> Let me handle it)
It will detter future possibilities if it's too early. That's why most crossovers are either it's the end of those series or they are happenings of an alternate time of what if's.
If you read my story till the latest, I assume that you will have major trouble grasping my character's personality, I won't elaborate because it will spoil and you might hate it. T_T
It was actually more further, but when I re-read it... not to mention yesterday was my father's birthday.