* Rodrick: Rodrick is Greg's older brother, and he remains largely unchanged throughout the series. He is still the rebellious, immature, and annoying older brother who often gets Greg into trouble. While he has some moments of vulnerability, he doesn't undergo any major character development.
* Manny: Greg's little brother, Manny, is also relatively static. While he's still a baby, he becomes more mischievous and often gets away with things. He doesn't experience a significant character arc.
* Susan: Greg's mom is generally supportive, but she also has her own opinions and routines. She tends to be consistent in her reactions and doesn't undergo a drastic shift in character.
Important Note: These characters, while considered relatively static, still have their individual complexities. Even if they don't experience major development, their interactions with Greg and others can reveal more about their personalities.
It's worth noting that identifying truly static characters in a series like "Diary of a Wimpy Kid" can be challenging because even seemingly unchanging characters can reveal new facets of themselves over time. The focus of the series is on Greg's coming-of-age journey, so other characters often serve as supporting roles that help shape Greg's experiences.