Learn to Draw Cartoons https://www.amazon.com/Learn-Draw-Cartoons-Easiest-Cartooning/dp/1640210504 https://fourcolorsgame.com/

Well book wise, James Gurney's both books Imaginative Realism and Color & Light is really your friend. Me personally I don't think using books helped that much in terms of imaginative ideas, but technique wise they hinted maybe several things. Mostly I think what you should do is just draw a lot... Draw what you like, and find out why you like and don't like a specific piece, like... how the shape is wrong, or how the shading doesn't read well, and repeat. Soon you'll have your own approach to doing imaginative stuff :D

Hey, this might interest you :) https://www.silvertoons.com/store/character-design-handbook

Hi Sagnik Are you a beginner when it comes to drawing in general or just as it relates to cartoon characters?

Try taking a look at this book. May be what you're looking for? https://www.amazon.com/Freehand-Figure-Drawing-Illustrators-Mastering/dp/0385346239/ref=sr_1_6?dchild=1&keywords=drawing+people+from+imagination&qid=1621572729&s=books&sr=1-6