In a recent episode, 3 new characters were introduced:
Amanda, Candace's daughter in the year 2020; voiced by Jennifer Stone.
Xavier, Candace's future son. Voiced by Noah Munck.
And Fred, another one of Candace's future kids; voiced by Moises Aries.

I also noticed a major lack of other characters such as the fireside girls, the kids' friends, and other parents.

A complete list of characters can be found here: http://phineasandferb.wikia.com/wiki/Category:Characters

Thankyou

The 3 Characters you name have now been created.

We (in general) only show major characters.

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