MY SELFLESS UNCLE; A person i admire

The person i admire is my uncle micheal,he is a bit lite in complection,he is three inches taller than me.what i admire about him is that he is very generous and kind with everyone,he likes helping people and doesnot expect anything in return.

The person I admire is my uncle Micheal. He is a bit lighter in complexion and three inches taller than me. What I admire about him is that he is such a generous and kindhearted person to everyone. He is very selfless and helps people without expecting anything in return.

"selfless" is a good keyword which means the opposite of "selfish"

My selfless uncle;the person i admire

Now i have to dsescribe my uncles physical features and his distinctive charactericts

Yes you need to describe him (physical features and characteristics), but just briefly. More important thing is how he has influenced on you.