Some first reactions to the first four videos:
JoJo - I'm here for a shady Italian girl with a big personality playing the game. I think she'll have an entertaining meltdown or two throughout the season and divide the house, though she'll probably go down in flames mid-Jury time. She might end up being very whiny, but an alliance with the house gay could be cool. I hate when they cast people who never/barely watched the show though.
Kara - Like I said earlier, she's a boring token hot white girl. She is opposed to fighting and loves Jordan (
). She's gonna be a floater, though it seems like she will definitely be in a showmance if there is one so that may make her relevant.
Shane - Okay, Kara and Shane were cast to date each other. He wants a Southern blonde with a tan, exactly what she is. Or Ashley, though she isn't Southern. It seems like there's a notable shortage of buff guys, so all strength competitions will probably be between him and Willie.
@ him thinking telling people he models will hurt him when he's clearly a Greek god model type. He wants to be a Brendon-Jeff-Hayden combination... I pray that doesn't turn out to be an accurate description for him. He's charming though, so I hope he amounts to something better. Another person who never watched the show before applying.
Wil - 
@ "I'm 23, I'm turning 25 in July." I'm sad Mike was cut, he could have been a perfect boy for Wil and formed the first gay BB showmance. In the video, he said he would fake insanity to get out of the house if Rachel was cast, but in his bio page he says he likes her?
He has a cute personality though, and he'll probably be a big star of the season. I hope he lasts a while and aligns himself well.
Splitting this up so it isn't too big of a wall of text.
He's gone.
He seems like a darkhorse. 
Not here for another Jordan.
He's cute, I can already see him being a fan favorite.
I love that we share the same favorite houseguest.