Once the population of your Springfield gets above say 20 Characters and you have more than say 50 Buildings, keeping track of each character to be sure that they are not standing idle when they could be either doing a Task for extra Money and XP (as if there IS such a thing as "extra" money) becomes a very daunting challenge.
Since Buildings do a very good job of hiding Characters even when they don't mean to, the players began to lobby EA to add a Character Locator Utility or Tool into the game -- something that Ea somehow managed to avoid doing for a long time! Well, that avoidance behavior has now ended!
The Character Finder Tool / Utility
Right then, it should probably be noted just for the record that despite the fact that the new Character Tracker and Location Tool and Utility was added to the game with the Christmas 2013 Content Patch and Update, this new game utility and expansion object was NOT officially or otherwise part of the Holiday Patch, the Holiday, or its associated events.
That being said the new Character Finder Utility is, strictly speaking, now a reality and part of your game and your town, and good on us!

The Character Finder Utility Tool takes the form of a new box that appears in the upper left-hand-corner of the Game Play window that will display the icon for the character it is presently set to.
The utility button is easily identified by the presence of the tiny magnifying glass in the bottom-right-corner of the Icon itself.
Using the New Tool
To use the new Character Finder Tool simply tap it with your finger and it will cycle through The Characters that are part of your Springfield.
As each new character appears in the Utility Icon the game will open their Quest Box to show you what quests as well as special missions (special missions are highlighted in yellow text) that they have available.
Not only does this new utility make it wicked easy for you to locate a given character, but it also makes assigning them a Task so that they are not idle that much easier!
This is actually an option that players have been requesting from EA for more than a year -- in fact the first time that you use it you get a dialogue between Lisa and Homer that essentially communicates that fact.
xxT-Trainxx
Daily player right here add me ---> SBSTAUFF
Add me omni42 play everyday
Add blantond13314
Add me please kaarinp8694 daily player
How can I get the airplane for springfield, and how come there is no fire truck in this game,
Add me plz daily player shawnbille269
You will find that you have better results being added by posting the request to the Community and Friends Section of the guide - which is what it is for...
irish_boy547
add me trent469
I play daily please add me jbeachler1101
I play throughout the day - Noeltorious
please add me dannyak47 I can't stop playing this game!! !!!
Please add me ID fb939834127
Dailly player here add me pls -yocammayo
Add me please daily player here ---> yocammayo
Add Pixiestripe26
I haven't been able to locate Apu. I gave him an extra long task at the Quickemart. Now he doesn't appear when I click on the store. Does a character ever go missing?
I don't see the character finding tool
When visiting your friends' Springfields, always tap on the tile above the Squidport entrance if there is one present. Google Squidport glitch to see why.
Add me - jammer_or