and why are they sooo much good looking than some Northern Euros like the Brits or Dutch people
What do you mean by good looking?
Prettier? More beautyfull?
Hmmm... perhabs, maybe we have much
less cromagnonian genes than they...

But it is only the case in central Europe.
also and the Wends settled in Danelaw and other places.
Hmm... very interesting. Can you say more about that case?
And what do you mean by Wends? Pomeranians?
Like other nations, Greeks are a combination of all of the civilizations that settled there; becides royal civilizations like the Norman's in England for example.
Anyways, Greeks are a combination of ancient Greek, Anatolian, Slavs and maybe Celts and Goths.
Russians the same thing, they are a mix of Slavic, Norse, Uralic and.maybe Tatar
You could write more simple: everyone is mixed with everyone
Let's settle on, that it used to be Slavic some time ago.
It's simply depends on, what we mean talking about slavic countres.
Osi's are probably mostly slavic people, who simply speak german
Something like 5 years ago, before Angela Merkel.
She is de domo Aniela Kazimierczakówna vel Wojciechowska

And she is more Pole, than I am
The main reason why Slavic women are very attractive is that they keep their figures toned. The reason for this is that they do not drive everywhere and do not eat high fat food like the women in the west do. This is not to say western women are decadent: its that Slavic women do not make much money and have to live on little food
It is really funny, I apreciate it.

But the final conclusion is simply stupid.
About this multiplying exterminations: why are you so obsessive? It wasn't so bad, as you decribed. Really.
The Slavs just moved into the areas that were deserted by the Goths, Burgundians, Saxons, Vandals, and Lombards.
Not deserted but severely depopulated. The closer West the lesser depopulation. Unfortunately what happened then we can only guess from archaeology and in future from genetics. These were Dark Ages and not much anything written survived.
Germanic tribes did not perish in 100%.
Some of them stayed in central Europe and later they were slavinized (do exists such a word?

)
Even earlier, germanic peoples cohabitated with Slavs.
Sure, I'm glad these days are over in Europe. But why did you use word destroyed? Obviously they were conquered and assimilated. It was never wise to kill off all taxpayers and labour force even in Middle Ages. Germany/Holly Roman Empire was rather multi ethnic, and as such didn't have policy of ethnic cleansing. Once a nation was conquered, there was no logical, ethical, economical reason to exterminate a population.
In Austria, Silesia and Pomeriania was no ethnical cleansing.
People germanized naturally. It begins with middelages' mode
on german language, and the first who was germanized were dukes.
The same was in many parts in Elba region. Especially in frankonia,
Saxony and Bavaria, were Slavic settlement were numerious, but
with some exeptions, did not dominate.
Here is a map wich shows, how far slavic settlements reach the West.
==>>
https://bialczynski.files.wordpress.com/2010/05/mapa-sc582owianie-nad-c582abc485-vi-viii-wiek.jpg
Even in XIX century were some slavic villages still exist as far as Hannover.
Aaaa. I must add that Abodrites conquered germanic Holstein in 795!

Charlemagne even got a king-title to their ruler.
I'm sorry, but you pick snippets from history and science, that you read, and are trying to fit your ideal vision of "history" or some agenda. Aryan, is the Irdo-Iranian tribe of Middle East. They never ever were in Europe.
LeBrok, I must stand in deffance of him because:
- some decades ago the term aryan = indo-european
- in many english language publications, probably mostly american, the term aryan still is using as equivalent to the term indo-european
- exists a theory, that the word arian, was a some kind of original self descibed term for indoeuropean people, which we can see not only in Aryana, Iran, Arya, Aryavarta and Armenia in Asia, but also in greek word aristocracy, celtic and english name of Hibernia: Erie, Ireland; in Lugian (germano-slavo-celtic) tribe Arii/Harii in the present day Poland and in germanic word for army forces - Haria, today Heer (and mayby word lord - Herr, have the same etymology). So who knows... Btw, name Arya is the most anciet known name for indoeuropean tribes; especialy another R1a people were exists whithout known names thosands of years, and get their names millennia later, or still don't have a name (as for example Balts

)
1) Population density in Wielkopolska during the 600s-700s:
Where did you get this?