  In this article we develop the theory of $\delta$-characters of Anderson
modules. Given any Anderson module $E$ (satisfying certain conditions), using
the theory of $\delta$-geometry, we construct a canonical $z$-isocrystal
${\mathbf{H}_{\delta}(E)}$ with a Hodge-Pink structure. As an application, we
show that when $E$ is a Drinfeld module, our constructed $z$-isocrystal
${\mathbf{H}_{\delta}(E)}$ is weakly admissible given that a $\delta$-parameter
is non-zero. Therefore the equal characteristic analogue of the Fontaine
functor associates a local shtuka and hence a crystalline $z$-adic Galois
representation to the $\delta$-geometric object ${\mathbf{H}_{\delta}(E)}$. It
is also well known that there is a natural local shtuka attached to $E$. In the
case of Carlitz modules, we show that the Galois representation associated to
${\mathbf{H}_{\delta}(E)}$ is indeed the usual one coming from the Tate module.
Hence this article further raises the question of how the above two apparently
different Galois representations compare with each other for a Drinfeld module
of arbitrary rank.
