I was analyzing the signatures of each of the amis following this image I found on the french wiki, the person who did this is kind of perfect;
image available in: https://les-miserables.fandom.com/fr/wiki/Les_Amis_de_l%27ABC
Grantaire’s signature is large and with many sinuous curves, in addition to taking up much of the leaf. Large letters signal an outgoing, sociable person who likes the spotlight, larger letters indicate receptivity to other people and new experiences. Roundness means that he likes to keep people close to them happy, and curvy letters show he tend to be a creative and artistic person. Exaggerated roundness like the one shown in your R can also suggest ingenuity, communicability, loquacity, exaggeration or pedantry, but on the other hand it can also indicate false self-confidence and a desire to be who he are not. Another thing is that his handwriting is smooth on paper, lighter writing and less marked denotes sensitivity and compassion, usually accompanied by apathy.
Finally, the way he takes the role disproportionately compared to colleagues may indicate a distortion in his own image, a need to be seen and/or a search to meet socio-affective needs.
Combeferre has a very small signature, small letters signify shyness, perfectionism and great ability to concentrate. His handwriting is strong too, that is, he uses pressure with the pencil and marks the paper more: People who write strongly take things seriously and tend to be inflexible. This shows how he is the sage, the guide, the philosophy of the group.
Enjolras’s signature is kind of pointed: pointy signal someone who works hard and has ambition, also pointy letters represent intensity of feelings, aggression and intelligence. One thing to watch out for is that the end of the writing feels more rushed next to the rest: this could be impatience and appreciation for efficiency. Another notable thing is that the first letter E is well marked, pointed and bigger than the rest, this means a more aggressive initial presentation, and the rest letters however it appears more shy, withdrawn and soft afterwards. The rest of the letters are smaller and much closer and glued together, which may indicate that he like to be together with friends rather than alone.
Feuilly and Courfeyrac have signatures spaced out and in ample size, a larger spacing between words means that the person is independent and likes open spaces. They like freedom. It seems that they are free and creative spirits. Possibly childish and/or witty. Feuilly in particular has a very readable handwriting that demonstrates someone safe and content with themselves. Coufeyrac, on the other hand, has a very soft handwriting that even seems to get softer at the end, lighter and less marked writing denotes sensitivity and compassion.
Jehan writes in a punctuated and well-structured and detailed way, which speaks of his person, lyrics that are very ordely of methodical and orderly connection, in addition to a careful signature that means that it is a person independent and accurate. The lyrics also get closer which can mean softness and compassion, and a little apathy or melancholy.
Bossuet, he marks the end of words well, end marks and a tendency to go to the right side of the margin can indicate people who prefer to think about the future than stick to the past (This may explain why Bossuet has several unlucky experiences, but he is always witty).
Joly and Bahorel have illegible handwriting, an illegible signature can indicate a reserved person who values privacy. Bahorel, comes with a strong letter that marks the role more, strength indicates people who take things seriously and tend to be inflexible. Joly, on the other hand, being a doctor, this can influence and indicate that his quick and irregular signature show impatience and appreciation for efficiency.
P.s: keep in mind that this is superficial, a real analysis is much more thorough, detailed and analyzes more than one document in several different situations and dates, in addition to doing other tests and interviews with the person.
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