Biomass-based briquetting is widely used to improve waste combustion efficiency, management, and treatment. This work focused on the novel utilisation of water hyacinth found in Kerala freshwater lakes for briquetting. Water hyacinth is an aquatic weed considered an environmental challenge to Kerala's aquatic life and social life. This study uses water hyacinth to create a novel mixture for commercial briquette manufacture, which is then compared to more traditional biomass-based briquettes made from sawdust, coffee husk, paper, and wood chips. The prepared briquettes were subjected to mechanical and thermophysical characterisation research for a comparison study. Moisture content test, shatter resistance test, water penetration resistance test, impact resistance test, calorific value, and water boiling tests were conducted. Water hyacinth briquette showed the lowest moisture content of 2.95 % and comparatively significant impact resistance and shatter resistance. The characterisation study confirmed that water hyacinth could be used as the primary biomass in a briquetting process, yielding a viable alternative fuel.