Ume Gaiden Episode Sasuke pays heavy homage to episode 20 of School Rumble season 2.
The characters Karen, Imadori, and Kosuke, especially the former two, were heavily referenced when creating Ume, Takeshi, and Sasuke respectively. Ume's split bangs, strength, and cute face were inspired by Karen. Takeshi's orange hair, easy-going attitude, and pervertedness were inspired by Imadori. Karen's crush on Imadori cemented Ume's crush on Takeshi when I created them. Kosuke inspiring the name Sasuke. Karen Ichijou also inspired the creation of Michi, hence her green hair, inspired by a dream I had where I was on a date with Karen only my dream named her Michi. Because Ume and Michi were cut from the same cloth, I made them rivals.