Izabella can be bossy, condescending, and sometimes even have a bad temper. But aside from that, she is also cute, friendly, insecure and protective. As the oldest sibling in her family, she's supposed to act responsibly and maturely, but she doesn't always act like that.
She likes to keep her shoes under her bed for unknown reasons. She doesn't like the others touching her possessions, and she's also very territorial as she loudly yells at anyone who goes into to her room without permission before kicking them out.
In some occasions, she acts without thinking and commits malicious actions against the others for her own selfish benefits, but since her love for her family always comes before any petty problem, she has a caring heart underneath a rough exterior, and she will always try to fix her mistakes. Deep down, Izabella is insecure and is usually frustrated with the responsibilities and burdens of having to take care of her younger sisters. It is also shown that while she gets annoyed and easily agitated by a lot of people, she feels lonely without the people she loves and cares about (ESPECIALLY her younger sisters) and her worst fear is in fact, losing them forever.
All this makes her noticeably similar to Lori Loud.