The 'Lone Goat and Kid' story is great. It shows Usagi's honor and his sense of justice. In this story, he has to protect a young goat and its owner from various threats. It delves deep into his character, and the interactions between Usagi and the other characters are really well - written. There are also some intense fight scenes that keep you on the edge of your seat.
One of the best is 'Grasscutter'. It's a story full of adventure and honor as Usagi gets involved in a quest related to a powerful sword. The art in this story is also amazing, really bringing the feudal Japanese setting to life.
I'd recommend 'Usagi Yojimbo: Yokai'. It has a simple yet engaging plot that introduces the main character Usagi and the world he lives in. It also has some cool encounters with Yokai, which are Japanese supernatural creatures. It's a great way to get into the Usagi Yojimbo series.
Another great beginner - friendly story is 'Usagi Yojimbo: Senso'. It gives a good introduction to Usagi as a character. It's set during a war, and Usagi has to make some tough decisions. The story is not overly complicated and is a great way to get into the Usagi Yojimbo series.
Usagi's friends would be extremely worried. They would immediately start looking for her. They might split up to cover more ground and search different areas where Demando could be hiding her. They would also use their powers to try to sense Usagi's location. For example, if one of them has a power related to sensing emotions, they could try to detect Usagi's fear or distress.
Love and sacrifice is a common theme. Mamoru would sacrifice his time and energy to take care of Usagi. Another theme could be the power of friendship. Their friends would likely come to their aid during this difficult time. Also, the theme of hope. Despite Usagi being sick, there is always hope for her to recover and have a healthy baby.
The plot could involve Usagi's sickness being related to some sort of magic or enemy plot. Since she's pregnant, her powers might be affected. Mamoru, being the loving partner, searches for a cure while also protecting Usagi. There could be a lot of emotional turmoil as Usagi is worried about the baby and Mamoru is torn between finding a solution and being by her side all the time. Eventually, with the help of their friends, they figure out what's wrong and Usagi recovers, ready to give birth to a healthy baby.
Tuxedo Mask could also be in the harem. He has a long - standing relationship with Usagi, and in a harem scenario, his feelings for her could be even more intense, competing with others for her love.