Unity Inventory: Assigning Items & Special Usage Functions?

[HealthOnedubai]

In my Unity-based inventory system, when an item is used, where should I assign it to the character's attributes or effects? Also, is it possible to create a special usage function for each item? For example, can I implement item effects similar to a 'HealthOne' system or a house call doctor feature that activates healing or buffs upon usage?