Who are the best characters for a family of three?

The classic trio is Sulley, Mike Wazowski, and Boo, which perfectly fits two adults and a toddler.

How do we expand this for a larger family or group?

You can easily add characters like Celia Mae (with snake hair), Randall (purple/blue), Roz (red cardigan and pointed glasses), or a CDA agent in a yellow hazmat suit.

Is this costume comfortable for toddlers?

Yes, the Boo costume is incredibly comfortable as it only requires a soft cotton t-shirt, leggings, and sneakers, making it perfect for active toddlers.

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Monsters Inc. Family Costumes

Bring Monstropolis to life with coordinated family costumes for all ages.

Monsters, Inc. is a classic choice for family costumes because of its colorful, distinct characters that span all generations. This guide helps you coordinate a group look featuring Sulley, Mike Wazowski, Boo, and other Monstropolis favorites. The ensemble combines bright blues, greens, and pinks for a cohesive, fun family aesthetic that is comfortable for all ages.

Difficulty: Easy
Time: ~45 min
Budget: $40–150

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40 Monsters Inc. Family costume ideas

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What you need for a Monsters Inc. Family Costumes costume

Sulley fleece onesie
A bright turquoise blue hooded jumpsuit with purple spots and soft horns on the hood.
DIY: Glue purple felt circles onto a bright blue hooded sweatshirt and sweatpants.
Amazon
Mike Wazowski t-shirt or tunic
A lime green shirt featuring a large, single printed eyeball graphic in the center.
DIY: Paint a large white circle, blue iris, and black pupil onto a plain lime green t-shirt using fabric paint.
Amazon
Boo's pink oversized t-shirt
A plain, light pink crewneck t-shirt that fits loosely like a nightshirt.
DIY: Buy a plain pink t-shirt two sizes too large for your toddler.
Amazon
Purple scale leggings
Toddler-sized leggings in purple, preferably with a subtle scale or textured print.
DIY: Use plain purple leggings and draw faint scale patterns with a fabric marker.
Amazon
Monsters Inc. hard hats
Bright blue plastic construction hard hats with the blue eye logo on the front.
DIY: Print the Monsters, Inc. logo on sticker paper and paste it onto a blue plastic toy hard hat.
Amazon

How to put it together

1
Assign characters based on family roles, typically placing the youngest child as Boo and parents as Sulley and Mike.
2
Dress the Sulley character in the blue and purple spotted onesie or custom sweatsuit.
3
Put on the Mike Wazowski green graphic tee, pairing it with dark jeans or matching green pants.
4
Dress the toddler in the oversized pink t-shirt, purple leggings, and white sneakers.
5
Style Boo's hair into two high pigtails secured with pink ball hair ties.
6
Have the adult characters wear the blue Monsters, Inc. hard hats to tie the scare floor theme together.

Makeup & hair

Keep makeup minimal. For Boo, style hair into high, slightly messy pigtails with pink bobble hair ties. For Mike or Sulley, optional green or blue face paint can add a playful touch.

Tips

Onesies are perfect for cold Halloween nights, allowing you to layer warm clothes underneath.
Carry a decorated cardboard box painted like a closet door as a fun, themed candy bucket.
If you have a pet, dress them as a little green Mike Wazowski or a CDA agent in a yellow vest.

Monsters Inc. Family Costumes costume FAQ

Who are the best characters for a family of three?: The classic trio is Sulley, Mike Wazowski, and Boo, which perfectly fits two adults and a toddler.
How do we expand this for a larger family or group?: You can easily add characters like Celia Mae (with snake hair), Randall (purple/blue), Roz (red cardigan and pointed glasses), or a CDA agent in a yellow hazmat suit.
Is this costume comfortable for toddlers?: Yes, the Boo costume is incredibly comfortable as it only requires a soft cotton t-shirt, leggings, and sneakers, making it perfect for active toddlers.

Did you know? In early drafts of the movie, Boo was written as an eight-year-old, but the creators changed her to a toddler to make her more dependent on Sulley, which heightened the emotional stakes.