This feasibility study encompasses the experimental findings of utilizing lignin as a potential multi-functional epoxy resin modifier for man-made cellulosic fiber composites. Two types of lignin at different concentrations are used (with no chemical alteration) to modify the epoxy resin. The modified resin's potential for use in natural fiber-reinforced composites is evaluated through the characterization of mechanical and thermal properties. The influence of moisture on the stability of the mechanical performance is also investigated through the characterization of conditioned samples (RH=100%, T=50℃) against reference material. Preliminary results show that the addition of any type of lignin at low concentrations has a marginal effect on the overall system performance although the effect of the type of lignin remains hidden within the causes of self-agglomerations. The most notable difference concerning the lignin type used can be seen in the Tg-values for 5 wt% lignin addition.