A person is a person. Refer to the **individual** as such. 

***Examples:***

1)If anybody asked you about the money, tell the **person** that it is in my bank account.

2)I felt that somebody was in the garden but I did not see **anyone**.

3)  Speaker 1: A friend of mine helped me a lot.

  Speaker 2: You should thank **that friend/buddy/comrade/confidant**

4)Congratulations on your new baby! What's the **baby's/ child's/ offspring's/ broodspawn's/ youngster's/ squirt's / toddler's/ tyke's/ kid's/ infant's/ youth's** name?