Sprout is a tall, adult strawberry toon who wears solely a white scarf with thin pink stripes wrapped around his neck and draped over his back. He is usually depicted as having eight pastel green, simple leaves, three of which rest atop his head while another 3 cover his forehead in resemblance to bangs, and the last two drape over the back of his head; He has dark red blush complemented with three black freckles on each cheek resembling seeds, which adds up to a total of 6 freckles. His limbs are a reddish pink color, being lighter than his torso and head. Sprout is a straightforward, overprotective, and pragmatic Toon, as shown in his Passive Ability, being coined as "Overprotective". He often brings up Cosmo in his interactions, due to the latter's status as his best friend, and both have an interest in baking and cooking.

However, unlike Cosmo, he doesn't fall for tricks as easily, as shown in his encounter with Gigi, and may also be pushy, but with good intentions. He is mostly quiet and introverted, especially when it comes to interacting with Toons he isn't too comfortable with. Sprout's more open and excitable to the Toons he is closer with, like when he is with Cosmo or Ginger. Because of this, Sprout is not the best Toon at socializing, shown in the interaction with Vee. He assures if she's okay, but inadvertently points out one of her insecurities. This can also be shown in other conversations.

Though he isn't as gullible, he seems to be clumsy or forgetful sometimes, as seen in a TV recording where he leaves the oven unattended, causing a fire that Sam then hurriedly puts out. Mentioned in a log on one of the Warehouse Floors, this seemed to happen frequently, as Sam said they are always busy watching him to make sure nothing burns down. This seems to be reflected in his descending dialogue, as he may say "Did I remember to turn off the oven? Hope so!".

Sprout's bluntness and no-nonsense attitude may make him come off as stern at times, despite his soft appearance. But at his core, he is very protective and caring, if a bit overbearing towards the other Toons. In multiple instances, he always looks out for their well-being, such as in his dialogue with Looey, firmly reassuring him that he is "never a waste of anything." This care is particularly potent with his best friend Cosmo, with Sprout going so far as becoming mad when Shrimpo states that he hates Cosmo's cooking. According to his interactions with Squirm, he seems to have kindness towards the insecure toons, telling him that he would bake an apple pie for him. Sometimes he even appears to panic at the thought of any Toons being in a perceived peril, as shown when Poppy yells out his name, causing him to immediately ask if she's okay. This however doesn't prevent him from teasing his fellow Toons, pushing it too far in the cases of Vee and Glisten.

Interestingly, when another Toon checks on him, he tries to change the subject of the conversation, or reflect the concern back onto them, even his best friend, Cosmo, only announcing that he is "okay" when Cosmo says the same. He also shrugs off help, such as when Goob offers to carry him.

Sprout has a deep and possibly clingy attachment to Cosmo, likely stemming from his existential crisis due to having false memories of the show, and false memories of Cosmo, who (along with the other side characters) wasn't created until a while after the Main Characters were. Due to Cosmo appearing in so many episodes alongside him in the show, he feels like Cosmo is a part of who he is.