All my children are different. In fact the 2 most alike are DS and DSS1 
DS1 (9) was a very laid back baby, good sleeper, happy to just entertain himself. DH says DSS1 (9) was like this too. They are both outside now in the rain together building a fort apparently in the garden. They are both quite passive and ready to compromise - which does make me wonder how they ever actually finish building anything!
DSS2 (5) was always a demanding baby in terms of attention. He woke nightly until the age of 4. He has the biggest temper of the children (so far) but is also the most loving of them all. So far he has come in 7 times to say "YAK, DS or DSS1 said .......X" He will probably be fed up soon and come in for cuddles which the older 2 would never really have done at that age.
DTS1 (9months) - he's a whirlwind.
Always been very active, cheeky personaility and very much a giggler. He is walking already and already proving the distraction technique that's worked so well on the other boys to avoid distuction/ injury is not going to wash with him.
DTS2 - polar opposites to his brother! He is quite happy to be still in one place, is showing no interest in moving about yet. He is very much a watcher. Will happily sit and watch what is going on. He may possibly be my acedemic one as he is showing signs of making sounds like words atm.
DD - she is a gymnast
OK, she's not even born yet and is only 25 weeks gestation, but by god this girl don't say still.
If I had my own way she would be a combination of her brothers good points but something tells me as the youngest of 6 children and the only girl she'll have a unique personality of her own 
As for looks,
DS1 is ave height, slim, blonde hair
DSS1 is ave height, slim, brown hair
DSS2 is tall, slim, brown hair,
DTS1 slim, blonde,
DTS2 my chunky monkey, brown hair.