Sheepish voices are withdrawn, maybe because the speaker has something to hide, or they are simply embarrassed. This is the type of voice you associate with fear and a lack of confidence.
Maybe they have done something wrong, maybe they are afraid of being seen or heard by others, but whenever someone speaks in a sheepish voice, chances are that they are hiding something. A liar can act sheepish when confronted, and people also tend to adopt this voice to avoid sounding too arrogant or narcissistic.
It’s the character who is always uncomfortably under the spotlight. They are shy and easily embarrassed, and the audience loves them for it. Sometimes, a sheepish voice can be annoying especially when the speaker fails to enunciate their words properly. You are unlikely to hear this voice in radio or podcasts, but the sheepish persona thrives in character animations and skits. You can also use it to represent a character that is traditionally considered as strong, for instance, a sheepish lion.
Sheepish voices can be relatable, cute, but it can also be irritating. A sheepish character talks without any pride or conviction, usually with a low voice and minimal eye contact. Such a character holds back to the point of sounding remorseful and apologetic for their existence.
A sheepish character is not necessarily lacking in information, they simply have trouble expressing themselves because of the situation, or because they did something silly and are afraid of being called out. A nerdy character can be sheepish; full of relevant information but unable to express themselves with ease.