Meta is more motherly than anything else. She’s very over protective. If you hurt her Sarah Jane, she’s likely to turn around, and cause you quite a bit of damage. She’s not one for violence, and does believe an eye for an eye makes the whole world blind… but you will not harm her Sarah Jane.
Meta is the TARDIS humanoid of Sarah Jane Smith; the daughter of Ten II (Handy, the metacrisis) and Rose Tyler. Meaningly, before that she was Rose & Ten II’s TARDIS. Thus why she calls herself Meta (because Ten II was a metacrisis, get it?)