* Fragility: "Frail" immediately implies a sense of vulnerability and weakness. He might be physically small or thin, perhaps lacking in strength or stamina.
* Unpredictability: "Willow-wild" suggests a nature that is both graceful and unpredictable. Like a willow tree, he might bend and sway with the wind, responding to his surroundings in unexpected ways. This could imply a whimsical or even somewhat erratic personality.
* Sensitivity: The combination of "frail" and "willow-wild" might evoke a sense of sensitivity and perhaps even emotional fragility. He may be easily affected by his environment and the people around him.
* Artistic or Creative: The imagery of a willow tree, known for its graceful and flowing branches, could suggest artistic or creative leanings. Roger may possess a certain artistic sensibility or possess a creative spirit.
Overall, the description paints a picture of a person who is delicate, unpredictable, and perhaps emotionally sensitive. This impression might lead the reader to view Roger as someone who is gentle and potentially vulnerable, with a unique and possibly artistic nature.