Gift cards for friends

Hello there ! 
My idea is to make some custom cards and play with friends that are not part of the mtg community.
The custom cards i want to design would be representations from my friends, i mean, for example, lets call a friend Jhon, I want to make a legendary creature or planeswalker based on him.
For this to work i want to ask some questions to my friends, make them fill a kind of form with some key questions that let me design a card that represents their person or their likes..

Here is where i need some help from this community..

Lets say i want a card that represent someone.. What kind of questions do you think i need to make a design that fits reality..
/* Here i want to make a bracket : I try to design cards like this before and i was asking "If you could had 3 powers (not superpower), what would be?" This let me know that some of my friends wanted powers to acquire personal profit, to protect them from hostile enviroment or things, to know other people thinkings, or to help other people.. and even some of them connecting with animals.. */

thanks!!