So I read a book in Skyrim about the races in Akavir and there was one race which were kinda Khajiit like (but Tigers) and their Leader was half Tiger half Dragon.

How is that even possible?

How does it look like? Is there any fan art?

Does anyone know more about them?

That's Tosh Raka. He is possibly an aspect of Akatosh or a Ka Po' Tun who successfully dracochrysalised. Perhaps both, like Auriel. Not much else is really known about him since his only mention seems to be from Mysterious Akavir which already has a questionable credibility.

Well, the Khajiit already believe Dragons are just really big cats, so...

That book also has no authorship or indication of when it was written. It also claims there haven't been Men on Akavir for a long time, but both the skeletons at Pale Pass and the mural at Alduin's Wall depict men wielding katanas. I'd take Mysterious Akavir with more than a grain of salt.

Pale Pass happened a long time ago. And the physiology of Akaviri men vs. Tsaeci (sp?) is a subject of considerable debate.

Mysterious Akavir strikes me as sort of a Jules Verne-esque work of fiction, designed to astonish and amaze the ill-informed denziens of Tamriel with wild tales.

You'll notice the lack of crazy things in the Disaster at Ionith

Disaster at Ionith is vague at best, speculative at worst.

More importantly, it is a non-fiction investigative report, contemporary to the events explored. That makes it a much more reliable source despite it's vagueness.

Add in that all sourced lore regarding Akavir residents portrays them as "men", and the fanciful depictions seem like just that.

Note, there should be as many historical sightings of the Akaviri men as there are of the Akaviri beasts (if not more for this latter case).

For reference's sake, indulge in reading 2920, The Last Year of the First Era, Morning Star / The Arcturian Heresy / The Story of Lysirius.

As well as Pocket Guide to the Empire, 1st Edition: Cyrodiil/Skyrim and 3rd Edition: The Seat of Sundered Kings, Cyrodiil/Other Lands.

Now add the depiction of snake-like heads on the hilt of Duskfang/Dawnfang (which has similar attributes to the Tsaesci described

in Mysterious Akavir) as well as in the interiors of Fort Pale Pass (to which was home to aptly named hint called the Draconian

Madstone) and you've got a quite convincing viewpoint of Mysterious Akavir being mostly supported in it's claims of fancifulness.

And History of the Fighter's Guild.

My point exactly. Available lore regarding Akaviri residents depicts a mannish form of the Tsaesci (giving them varying degrees of snake like qualities and an affinity for snake like things and symbology) which directly contradict the text of Mysterious Akavir (which suggests that there are no men at all). With the other sources of lore painting a much more "boring" picture of Akavir combined with the complete absence of corroborating lore regarding the rest of the content, Mysterious Akavir should be treated as an in game work of fiction.

That isn't to say that it doesn't contain truth to some extent, but we can't rely on it as being truth since it stands alone in its content.

Except that there's no lore that calls or depicts the Tsaesci as men (excepting for the Annotated Anuad, which is a children's story). All depictions of bipedal Akaviri "men" have been called "Akaviri", and are sourced from the First Era. Conversely, all accounts that have detailed the Tsaesci specifically have described them as immortal vampire snakes, using sources from up to the mid/late Second Era.

Available lore regarding the Tsaesci usually depicts a more beastial form, as afore linked.

The text within Mysterious Akavir regarding the Akaviri men is commonly annotated as meaning assimilation, not ruin.
Which would then therefore explain a mannish Akaviri presence as footsoldiers within the larger Tsaesci invasion force.

Thus proposing that the snake-like Tsaesci were in less combative diplomatic, advisory or leadership positions.

IIRC wasn't Tosh-Raka one of the Ka Po' Tun who somehow managed to either mantle a dragon or manifest a dragon form? I read somewhere that he was supposedly the god-king of the Ka Po' Tun and planned to eventually invade Tamriel.

I'm gonna try to find the source for this, it was a very interesting bit of lore.

Ah, as I suspected it was from Mysterious Akavir. The bit about Tosh Raka is right at the end. It basically said he was the one Ka Po' Tun who succeeded in "becom[ing]" a dragon, and is "the largest Dragon in the world". It also describes him as "divine".

Crazy things are normal in the elder scrolls series, hell crazy things are normal on the whole of Nirn.

Yeah, but that makes it a bit of a red herring. We're used to crazy things so we have a tendency to assume everything is going to be wild and fantastical, whereas sometimes a foreigner is just a man with different clothes.

really big cats with scales and wings, to a khajiit everything is a cat.

Isn't it slightly racist to automatically associate Khajiit with Po'Tun despite no strong connection? "They're all cat people so they must be the same!" If you change "cat" to a real world ethnicity you'll hopefully see why it's so stupid and why it makes me sad every single time somebody does it. It's just a bad assumption to make and we shouldn't do it without more evidence.