How to add mini map buttons and re-allocate them?

[Hafflex 0]

Where are these small icon buttons located in GRF? I tried searching in my data.grf and I failed to do so 0,0

 

 

For the location of the npc in my mini map:

 

{ name = [=[Kafra]=], X = 154, Y = 187, TYPE = 4, },

 

 

How can I add my own TYPE of npc? there's only 0-6 types?

 

Thank you!

Edited October 12, 2016 by Hafflex