NiAl-28Cr(6Mo) eutectic in-situ composites are promising high temperature materials due to a high melting point, excellent oxidation behavior and their low density. To enhance the poor room temperature fracture toughness, high cooling rates are beneficial to obtain fine cellular-lamellar structures, which can be achieved by additive manufacturing. In this study, dense and crack free specimen of eutectic NiAl-Cr(Mo) in-situ composites have been processed via selective electron beam melting using an Arcam A2. This highly flexible approach allows both lamellar and network-like morphologies of the reinforcement phase by fine tuning of the process parameters. For alloys with a lower Mo content, also rod like structures introduced by discontinuous precipitation can be found in the additively manufactured composites. The wide range of microstructural types are analyzed by its microstructure, chemical composition and mechanical properties. In case of nanostructured phases, high resolution microscopy (TEM) as well as APT is used to understand phase formation, mechanical deformation and dislocation structures. Creep properties and high temperature flow stress are investigated in a wide temperature range up to 977°C. These can overcome the creep strength of P2 TiAl alloys. The room temperature fracture toughness is tested both macroscopic using three point bending and microscopic using micro bending cantilever prepared in FIB milling. The different microstructures are evaluated according to their crack propagation and fracture characteristics. In this study, it is shown that lamellar composites in crack arrester orientation show best fracture toughness, whereas network 3D interconnected composites show best creep resistance and high temperature flow stress. Therefore, the microstructure-properties correlation for in-situ composite processed by SEBM is a carefully chosen trade-off between beneficial properties at high temperatures or advantageous room temperature properties.