Hey there Marissa,
Welcome to planDisney and thank your for your question! Some of my sweetest memories of visiting the Disneyland Resort are when our little ones got to meet their favorite character, so I'm happy to hear you're thinking ahead about how to get your 2-year-old to meet his favorites!
My top recommendation here would be to spend a lot of time in
Mickey's Toontown. Not only is this a really fantastic place for young kids to explore and play, but there are also characters out and about constantly! On my past two trips, we've met Pete, Goofy, Daisy, Donald, and Clarabelle.
Additionally, there are guaranteed ways to meet Mickey and Minnie in this land as well by visiting them at their houses! In both
Mickey's House and
Minnie's House, you'll get to walk through and see the different rooms of their houses and then at the end you'll get to meet and take a picture with each of them! Just make sure to check your
Disneyland Resort mobile app to see when they're home.
Outside of Mickey's Toontown, my other favorite place to meet Mickey & Friends is right after you enter Disneyland Park in town square of
Main Street, U.S.A. Again, for this location just make sure to check the Disneyland Resort mobile app to see times that characters will be stopping by for photos. You can see this by navigating to the map tab then tap the top center section of the screen (it will probably say "Attractions" with a down arrow) and select "Characters." You'll get to see all the characters available to meet for the day and if you select "Show List," then it'll show the times throughout the day to expect them.
Thanks again for your question, Marissa! I hope you have a fantastic visit to the Disneyland Resort.
Have a Magical Day,
Greg