*cracks knuckles* Alright, let's tango with this question. Forewarning, I'm likely to ramble.
The god classification ... system thing I made for this game does things a little weirdly, so I figure I should explain it here for the benefit of future examples - I'll evaluate your examples outside of its parameters because they don't quite work in it, this is just for posterity and my own attentiveness or whatever. So first there's a god's ... we'll call it Category, what type of god they are. Sotek is a war god, Zeus is a god of the heavens, Grungni is a god of the earth. It might not describe their exact preoccupation, but it classifies what general sort of activities they generally participate in, the general tone of their blessings, etc. This level is all the Chaos Gods possess, they're too big for the nuance of the following things.
Next is ... I suppose Purview is a good word? Basically what they do inside their Category, how exactly do they conduct war or interact with the earth or whatever. What do they do with their general category. Sotek has the Purview of Bloodshed, which means that his form of warfare is very orientated around, well, shedding blood, being super aggressive, doing berserk rages and stuff. This level often determines what their blessings do, if not necessarily the form in which they do it in. Sotek's blessings thus give the blessed the ability to shed more blood in battle by becoming tougher in it, but the actual aesthetics and such are up to the third level of detail.
Third and last is Domain, which is basically the idea that's closest to the god in question's core concept. Sotek is Serpents because he's the serpent god of war, that's just his thing. Ulric is wolves, Sigmar is ... well, he cheats by using himself as his Domain, but if you discount that then he's Hammers or something, etc etc. This is where all of Sotek's venom aesthetics in his blessings come from, the snakes from the Ark of Sotek, all that kind of stuff. Basically whatever the identity of the god is. Sotek is a giant snake, Asuryan is king of the Eldar gods, etc. It's what they are, and what they most commonly appear as in the Warp/imagery of them/etc.
So, with all that out of the way, short blurb on each of them ideas. I'll try to order their keywords into Category-Purview-Domain, but it might not work for all of them.
- Life, protection, water - picturing something like one of those frogs that carries its young in its back. Blessings probably centered around protecting lizardmen from harm or healing them when they're wounded, through means of water - holy water that heals wounds, burns daemons, etc.
- War, victory, courage - Like Sotek, but less focused on killing all the things and moreso on really striving to win battles no matter the cost. Blessings would probably go around buffing/healing troops, both to keep them in the fight and allow them to fight harder so as to win quicker. Lizardmen don't really have morale issues as such so the courage domain would probably just translate to increased combat prowess or something.
- Fate, order, stars - Very slann-like god. Take
@ganonso's Kroak from his age of Sigmar quest and you've basically got a god like that. Blessings are probably visions of the future or something, or portents read in the stars that are scarily accurate.
- Magic, knowledge, wisdom - two purviews there, but that's alright, it's pretty obvious what intent that comes with. Again, very slann-like, but in a different aspect compared to the Fate god. This one is basically every/any True Neutral D&D-alike god of magic you can think of - blessings are basically spells the god gives to its clerics, and the various sorts of generic holy smitings and such if big enough ceremonies are mustered.
- Darkness, hunting, cunning - This one actually works really well as a set of words because it easily describes the god/dess when you read them. It's a god of the dark that hunts in a cunning way. Best example I can think of is another of
@ganonso's creations, Itzamatul from his AoS quest, who is Kroak's god-daughter and shadow assassin. Blessings would probably take shape around helping the faithful be sneaky and assassiny and stuff. Supernatural stealth, being able to call darkness on yourself, etc.
Having a generalized afterlife (which will be a godly research project you have to conduct before it becomes a thing) will be a component in doing pseudo-daemonic shit with lizardmen souls, and will probably make communing with Relic Priests a little easier. However, it isn't a path to reviving them, since by and large slann aren't affected by your god stuff. They are the masters of the arcane, and they hold no faith in the supposed divine whos creation they most likely masterminded in the first place.
Earthblood would be a fairly high-tier Very Hard, and Spined Kroxigors would be Absurd. The others aren't possible at the moment since they deal more with soul manipulation than body alterations. You'll need to complete that one research that deals with figuring that out - Basic Soul Structure Manipulation - to be able to do Skybloods, and then the subsequent advanced soul manipulation project gated behind that one to be able to do Starbloods. This is primarily because these particular breeds are marvelously, gloriously OP.
The ability to create whole new breeds like the Cue is unlocked after Basic Soul Manipulation, though I'll be sharply limiting the number of those things that I allow to be made, probably down to just one or two total. The amount of sub-breeds I'll let be created is a little more complicated - basically there'll only be 3 sub-breeds per lizardmen type allowed to be actively spawning, but you can create more types than that and swap out the ones that actually spawn every X turns, and slann can always spawn whatever type you want. This is primarily because it makes sense with the capabilities I've established, but also because it lets you guys eventually swap out Temple Guard out with something else and still keep that slot open, since every slann knows the spawning spell and can just manually spawn their own bodyguard for themselves.
Nope, that's (in this game at least) pretty much only a property of the Chaos Gods - part of what makes racial/people/non-chaos gods distinct from the Ruinous Powers is that they're stories compared to the single words of Khorne or whoever, and stories have to have a beginning point.
Also they don't horribly fuck up the Warp just by existing like the chaos gods do, which is kind of an important distinction.