If you were to introduce someone to Dragon Age...

Never thought about that before but you are right, that could be an effective spoiler free introduction to the series.  

What if he's ninjamanced by Leliana?

I don't think I could convince anyone of DA's merit in areas where I'm not convinced of it either. So, I'd mention the world. The different countries and cultures, their good and bad sides, the differences that go into conflicts, and their various philosophical and religious aspects and historical (in-world) roots. Then I'd mention how the games fit into that picture, and how you can engage with the world through quests and things you find. Oh, and the Codex of course. I might show them the World of Thedas books as well.

This is also the only constant that I highly appreciate throughout all games and their expansions. Combat gameplay? Ugh, DA2. Characters? Some good some bad but DAO has never been surpassed. Quests? The same. Visual appeal? DAI looks great, the others not so much (any more). There is some reinterpretation of history I really dislike, but all in all the world has stayed in the "highly appreciated" category.

It's what instantly sold me when I first started DA:O. The multiple playable origins was a highly appreciated bonus I did not expect, and sadly something we'll probably never see again in a BioWare game. The fact that CDPR is apparently putting that in CP2077 will be something to look forward to.

For me, the number one thing about the franchise is replay value.  The first playthrough a player can do this, that and the other thing. If the person likes the game and the playthrough, they can try doing the other thing, that, and this for their next playthrough.

Takes me back to my hilarious murder elf in Origins. Bald as a newborn, because he ain't got time for hair, and knifes anything and anyone in his path. It's pretty funny how Morrigan approves of just about every terrible thing you do.

Sorry break it to you, it is possible.
A camara shot of an ass, but a simple ass, as part of a body, no different from other asses in the universe.
And it took attention only because of constant reminders of exactly this ass from all over the places.

People's minds can be different, no need to explain such obvious thing.
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The question:
the only way to make others play DA games which would have worked with me as well: just I tell about those games with several small descriptions about awesome dialogues and choices/races/CC/combat systeme/tactics/graphics/number of my own PTs of each part/etc.
What exactly to tell depends on a person I am talking to and if I know that person more or less, I know how can at least try to lure him/her.

Flanderized?

*gasp*

That's iconic companions, good sir!