  We consider a family of twisted graphene multilayers consisting of
$n$-untwisted chirally stacked layers, e.g., AB, ABC, etc, with a single twist
on top of $m$-untwisted {chirally stacked} layers. Upon neglecting both
trigonal warping terms for the untwisted layers and the same sublattice hopping
between all layers, the resulting models generalize several remarkable features
of the chiral model of twisted bilayer graphene (CTBG). In particular, they
exhibit a set of magic angles which are identical to those of CTBG at which a
pair of bands (i) are perfectly flat, (ii) have Chern numbers in the sublattice
basis given by $\pm (n,-m)$ or $\pm (n + m - 1, -1)$ depending on the stacking
chirality, and (iii) satisfy the trace condition, saturating an inequality
between the quantum metric and the Berry curvature, and thus realizing ideal
quantum geometry. These are the first higher Chern bands that satisfy (iii)
beyond fine-tuned models or combinations of Landau levels. We show that ideal
quantum geometry is directly related to the construction of fractional quantum
Hall model wavefunctions. We provide explicit analytic expressions for the flat
band wavefunctions at the magic angle in terms of the CTBG wavefunctions. We
also show that the Berry curvature distribution in these models can be
continuously tuned while maintaining perfect quantum geometry. Similar to the
study of fractional Chern insulators in ideal $C = 1$ bands, these models pave
the way for investigating exotic topological phases in higher Chern bands for
which no Landau level analog is available.
