Cellular Al₂TiO₅ and Al₂TiO₅ – Al₂O₃ composite ceramics were obtained by emulsification of liquid paraffin in aqueous suspensions of mixed TiO₂ + Al₂O₃ powders, with subsequent burnout of the organic phase and 2-step reactive firing at high temperatures. The reactants ratio and paraffin to suspension volume ratio were used as primary parameters to control the phase composition and relevant microstructural features, while firing conditions were also adjusted for greater flexibility in designing Al₂TiO₅-based cellular materials. Taguchi experimental planning was used to assess the relevant impacts of 2-step firing parameters on phase composition and porosity, characterized by detailed XRD/SEM/EDS studies. The results emphasized the positive effects of Al₂O₃ excess in Al₂TiO₅ – Al₂O₃ composite ceramics on stabilization of the Al₂TiO₅ phase and also for flexible design of cellular materials with controlled porosity and phase distributions. Analysis of correlation matrixes identified the 2-step firing parameters with greatest impact on the porosity and phase composition, and these trends were confirmed by multivariate linear regression. The observed trends indicated significant differences in reactivity and densification mechanisms between compositions with nominal Al₂TiO₅ stoichiometry and composite materials. These differences were most obvious for samples with significant residual fractions of unreacted titania.