Variables in all areas

thx guys for your answers (i really appreciate this)

i wouldn't ask this question if i've just one controller in my application
or if my data are coming from a model only

my project contains currently about 200 Controllers and i dont want to instantiate this variables in a single controller
nor would i do this in a Base_Controller

my normal current project controller structure looks like

Code:

CI_Controller

 - MX_Controller
 -- Base_Controller
 --- Session_Controller
 ---- Application_Controller
 ----- Modules_Controller
 ------ Concrete_Controller

So i could load this in the Base_Controller
But the major problem is, that there are some Controllers (4 or 5) which are just extending the CI_Controller