I just got two kittens: from same litter, both female, they are just
over 10 weeks now. It is quite interesting to watch them play. But I
found they seem to have different cat-sonality.

They are both demestic medium hair, but one's hair is longer than the
other. The longer hair kitten is also bigger, eats more, when I pick
her up, I can feel the big stomach. Besides, she got longer hair, so
she looks one size bigger than her sister. The bigger kittens has
black and white mix mark all over her body, she looks more like a
puppy than a kitten to me. She is also stronger. But the other kitten
is more passinate to me, she has grey on her back and upper half of
her face, white on her stomach and leg and lower half of her face. I
can touch the smaller kitten anytime I like, but the bigger kitten
won't let me touch too much, she sometimes threats to bite me.

The smaller kitten is not as strong as the bigger one. The bigger one
can jump onto a paper box, but the smaller one can't. But she is
smarter. I fliped the bed over to cover her in, she tried to get out
and did figure out a way to do so. But the bigger and stronger kitten
can not.

The bigger kitten sometimes acts like a boss. For example, one
morning, when I open their box, she is washing her face, but she use
one rear leg to keep her small sister stay, then after she has done
washing face, she came out first.

But when they fight, I found the smaller kittens took upper hand a lot
of times. The trick is she get down on her back first, so she can use
all of her four legs to fight: she often goy hold of the head of the
bigger kitten using her two front legs, then kich her using her two
rear legs.

I do not have names for them yet, because I think good names should
come naturally, not forced.