Help on making 'hook' objects? + NPCS?

[temor]

hi so im planning a Sonic Unleashed inspired mod but there is one of the things that I can't seem to just somehow find a solution to

How do you make an object/sector that can be targeted by characters with homing attack but not break/explode/commit die?

now for second question is npcs

there are tons of them in the page but idk how to make one, can someone explain it to me?