You should be able to add a shape component (like BoxComponent) to your character. Just make sure it’s marked as Movable and set up its collision appropriately (for example use preset Trigger). Once that’s done you just implement “overlap” events and you’re golden 
Cheers,
–mieszko
I have an AIChar Move from point to point by him self.
my question is how to add trigger volume to the AIChar and move with him.
thank you that’s all i need but can i change the shape of the shap from box to cone ?! if that possible how can i do it ?!
Thank you again i will try 
Try using other shape components. AFAIK there’s no cone-shaped collision component, but there’s “capsule”, and “spline”, although I have no idea what it does 