1knows a lot about different things
a mine of information
2can do many different things
a (wo)man of many parts
3young, but clever and successful
a whizz kid
4nice, full of energy and enthusiasm
got plenty of get-up and go
5has many interests
has plenty of strings to her bow
6someone who likes working hard or doing things other people would find unpleasant (humorous)
a glutton for punishment
7very nervous and easily upset
highly strung
8behave in a silly way
act / play the fool
9puts himself first, as he thinks he is the most important person
look out for number one
10speak angrily or critically to easily control or defeat someone
eat someone for breakfast
11a man having a secret sexual relationship with someone not his wife or girlfriend
a love-rat
12someone who cannot be trusted because they act in an unpredictable way
a loose cannon