When we talk about the pyrolysis of biomass wood, manures and diverse wastes are converted into biofuels which are gases or liquids as combustion for renewable fuels and the left over biochar which is the resistant material composed largely of aromatic carbon which is used largely for its soil improvement potential. Melanins and lignin can have a high amount of aromaticity and both would yield significant amounts of residual char. I believe lignins are more refractory than melanins so melanin could yield more biofuel but probably slightly less char. The yields of these fractions are much related also to the temperatures used in pyrolysis. Higher temperature yield more biofuel less char and under the higher temperatures the char alkalinity increases with temperature of charring. If char was to be used for alkaline soil areas the use of high temperature chars might be counterproductive. In areas of highly acid soils the higher temperature char might be more useful as a liming agent. When people char something the characters of the chars are not as different as the difference in the original source materials. As in composting the original material will not necessary reflect the original source when charred or composted they will become more similar based on conversion process. This being said some difference between diverse materials can be noted in charred and composed materials but they do become more similar in many respects.

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