I know Becca might be classed as a "boring" character, but I like here. She is, in fact, one of the only caring characters that seems to care about others rather than moaning about her woes (eg. Mandy, Zara, Lisa, the Burton twins)
As for Lisa.....well, she is turning into a bunny boiler. Hardly surprising though what she has been through, she had a brother in law who turned out to be a serial killer, her sister put her own brother in jail, and then her brother died. Along with all the self harm, her mum and dad's divorce, its's quite a lot to go through and I suppose this is her way of coping. I think it's quite clever how they have developed her character