The character that is not typical of the class Mammalia is option 'C' - Ten pairs of cranial nerves.

Explanation:
Mammals are a class of vertebrate animals that possess certain characteristics that distinguish them from other classes of animals. These characteristics include the presence of mammary glands, hair or fur, a four-chambered heart, and a diaphragm for breathing. They also have a highly developed brain with a specialized region called the neocortex.

In terms of cranial nerves, mammals typically have twelve pairs of cranial nerves. These cranial nerves are responsible for various functions such as sensory perception, motor control, and autonomic regulation of organs. However, it is important to note that the number of cranial nerves can vary among different species within the class Mammalia.

In the case of option 'C', it states that mammals have ten pairs of cranial nerves, which is not typical. This statement is incorrect because mammals generally have twelve pairs of cranial nerves. The twelve pairs of cranial nerves are:

1. Olfactory nerve (I): Responsible for the sense of smell.
2. Optic nerve (II): Responsible for vision.
3. Oculomotor nerve (III): Controls the movement of the eye muscles.
4. Trochlear nerve (IV): Controls the movement of the superior oblique muscle of the eye.
5. Trigeminal nerve (V): Responsible for sensation in the face and control of the muscles of mastication (chewing).
6. Abducens nerve (VI): Controls the movement of the lateral rectus muscle of the eye.
7. Facial nerve (VII): Controls facial expressions and taste sensation.
8. Vestibulocochlear nerve (VIII): Responsible for hearing and balance.
9. Glossopharyngeal nerve (IX): Controls swallowing, taste, and sensation in the throat.
10. Vagus nerve (X): Controls various autonomic functions, such as heart rate and digestion.
11. Accessory nerve (XI): Controls the movement of certain neck muscles.
12. Hypoglossal nerve (XII): Controls the movement of the tongue muscles.

Therefore, the statement in option 'C' is not typical of the class Mammalia, as mammals generally have twelve pairs of cranial nerves rather than ten.