In All Grown Up!, set approximately nine years later, Kimi grew up to some extent. Kimi is still adventurous and free spirited and has also grown to be spunky, independent and more aware of other's feelings. She's very athletic, for example At a ski resort, while Angelica signed up for spa-like activities, Kimi signed up for "daring" activities like rock climbing.

She had a tendency to buck the trend on how she feels about and treats less popular kids, including Z, and never judges people for their appearances. She was also portrayed as being supportive of her best friend Susie when she was in need. When Susie is having problems, Kimi is usually there to help. However, she is also portrayed as having a tendency to hold grudges. Angelica Pickles could be considered somewhat of an associate, but grudgingly so on Kimi's behalf.

Kimi is shown to be a born opportunist, ready to take advantage of any opportunity life offers. A classic example can be found in the episode, "Chuckie's In Love", where she sees a chance to attend a Sulky Boys record signing with Lil by letting Chuckie take over her shift (which, incidentally, falls at the same time as the signing) in exchange for a makeover.

It's been revealed in the episode "Dude, Where's My Horse?" that Kimi cannot cook.

She is also extremely fond of animals.

Kimi works part-time at the Java Lava, her family's coffee shop, with her brother, Chuckie, her father, Chas (who is the owner of the Java Lava).

She revealed in "TP + KF" that she carved the said initials in the Finsters' cellar years ago when she had a crush on Tommy although Tommy said that he was not attracted to Kimi but he secretly is. But Kimi and Tommy might still have feelings for each other. In the pilot episode "All Growed Up" she has only four lines and then never said one word throughout part two of the pilot.

Kimi speaks her native language, Japanese, on All Grown Up very briefly on the episode 'Memoirs of a Finster' when she does a report on her Japanese heritage.