We introduce the class of split regular BiHom-Leibniz color algebras as the natural generalization of split regular Hom-Leibniz algebras. By developing techniques of connections of roots for this kind of algebra, we show that such a split regular BiHom-Leibniz color algebra L is of the form L = U ⊕ P [α]∈5/∼ I[α] , with U a subspace of the abelian subalgebra H and any I[α] , a well-described ideal of L, satisfying [I[α], I[β]] = 0 if [α] 6= [β]. Under certain conditions, in the case of L being of maximal length, the simplicity and the primeness of the algebra is characterized.
