How does David Almond represent the characters Michael, Mina and Skellig in his book Skellig?

In David Almond's book, Skellig,
Michael is presented as a young man with serious concerns: he is especially fearful that
his baby sister will die. He loves her so much that the things that have been important
to him in the past are pushed aside. He tips into his parents' room to look in the crib,
just to see if she is all right. Michael is a serious young person, but when he
discovers Skellig, he is able to assist him—this helps Michael because he can do nothing
for his baby sister, but he can be there for Skellig.

Mina
is a neighbor who is "outspoken" and scientifically minded—she is deeply interested in
birds and other related topics:

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[Mina] is obsessed, for the moment, with birds
and the archaeopteryx, the evolutionary step between dinosaurs and modern
birds.

She decides to share
her pictures with Michael, and there are many, including finches (her
favorites):

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She opened her
book...

It was full of birds. Pencil drawings, lots of them
colored in blues and greens and
reds.

Mina tries to get
Michael to see the world from a different perspective. He helps her to become more
adventurous—living in the world rather than watching it as from the outside. She is
supportive and encouraging of Michael. He also trusts himself more when he realizes that
Mina can see Skellig also—he decides he is
not going crazy. Mina, as well as Michael, begins to grow as she
helps Michael care for Skellig.

Skellig is a creature
unlike anything Michael has seen before. When Michael finds him, he thinks Skellig is
dead. He is like a pile of trash tucked away in the
garage.

I
found him in the garage . . . He was lying there in the darkness behind the tea chests,
in the dust and dirt. It was as if he'd been there forever. He was filthy and pale and
dried out and I thought he was
dead.

Skellig is at first
lethargic and unwelcoming—but soon he relaxes, begins to speak, and soon thrives on the
positive energy and kindness that Michael and Mina shower him with, including aspirin
for his "Arthur-Itis" and Chinese food, numbers "27 and 53"—his favorites. After dinner
at home one night, Michael saves some food:

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I tipped what was left of 27 and 53 into the
takeout tray and put it in the outside
bin.

Eventually Skellig
becomes stronger and healthier. The youngsters come into their own when they care for,
and begin to love, Skellig.

It seems that Skellig also
possesses supernatural "powers." And the children are able to witness miracles in this
angel-like creature.  Skellig shares his own brand of magic with the children, and they
see his potential: how miraculous he is. He is awe-inspiring; but the children, too,
have demonstrated their own kind of magic is seeing Skellig for who
he is, and caring deeply about him, regardless of how he looks.