The stability of blade rotors remains an ongoing and significant challenge for manufacturers. The purpose of this study is to explore the dynamic behavior of a four-blade rotor, highlighting the frequency coincidences and their associated mode shape changes. The dynamic response and natural frequencies of the blade rotor are discussed through the examination of the impacts of key parameters, such as rotational speed and pre-twist angle. Using ANSYS Workbench, a numerical modal analysis was conducted to determine the first five natural frequencies and mode shapes. The results show that the blade flapwise modes are significantly affected by the rotation speed. A parametric analysis showed that the pre-twist angle's variation causes frequency coincidences and mode coupling, which lead to significant mode shape exchanges. These exchanges highlight specific ranges where frequencies converge, creating areas of high sensitivity in rotor performance. Using these findings, rotor design can be optimized and mechanical stability and resilience can be improved across various operating conditions.