She was Max's best friend - so she was by proxy my "best friend" throughout my Life Is Strange playthrough.
But it's really lame how she says Step-Fuhrer and Hella? So what - she's an 18-year-old punk-rock girl in modern day America - these people will have vocabulary and mannerisms different than you.
But she's so whiny? The girl has lost everything important to her. Her dad dies. Her lover (Rachel) is missing. Her own best friend (Max) disappears from her life for 5 damn years.
I wouldn't change anything about Chloe. I wouldn't change anything about the dialogue either. It gives a window into modern day tweener/teenage Americana. Before I played Life Is Strange I never knew what "kek" meant - and I find it cute that only thanks to this game, dev'd by a French studio, have I gotten a glimpse into that word and other mannerisms.
But maybe I have a truly soft spot for this game only because of the Pacific Northwest setting. I don't know what it is about Oregan/Seattle and the Pacific Northwest of the USA but this setting hits the sweet spot for me. From Alan Wake, to Gone Home, to Life Is Strange, I feel like there's something particularly magical when a dev tries to tackle that setting. So, Max and Chloe and all their "hellas" and "keks" are possibly getting a pass because of that.