seasons greetings - help me create an advanced clan, please!

Hey there! I would love to help. I certainly don't mind the name Lionclan.

I would, personally, love to create prefixes/suffixes and a list of herbs(largely dependent on where this takes place, but I'm willing to do research.) I'm also willing to do traditions if you can give me some time?

Hm, well I've a few ideas:

-In the Southwestern US, possibly Southern California, or any other place with a chaparral biome? It's not quite a desert but would pose interesting challenges nonetheless, like fires and possible food/water scarcity.

-a clan set in an urban setting, I was thinking perhaps around the River Thames/London? Or some other city built around a source of freshwater.

-A clan set in ww1-2/early 1900s England/other European nation?

That sounds great! There are many chaparral biomes around the world, so are we going for So. Cal, Portugal/Spain, Northern Algeria/Libya/Egypt, Italy, Southern Greece, Western Chile, or the borders of Turkey? Personally, I prefer So. Cal and/or the Iberian Peninsula because I'm more familiar with them, but whatever you want is more important.

It helps to narrow it down, for prefixes/suffixes that'll come later. 

All right. I've got some traditions/religious traditions on the brain right now, so:

-Perhaps a nomadic clan that migrates since it would likely be far too dangerous? They'd also be veeery unlikely to be longhaired cats(heatstroke being a consequence.)

-Maybe they revere fire and/or rain as a deity? Fire, while definitely destructive in chaparrals, allows many plants to reproduce and for the chaparral to heal. Rain, of course, is self-explanatory and brings prosperity etc. As far as a prefix/suffix goes I think Rain- and Fire-/Sun- (and Moon-) should be considered holy. If there are multiple clans, then they shooould have different religious systems. As far as what happens when a cat dies, perhaps it's less like starclan with ghosts/spirits and more like their ancestors going on to carry on life. For example, a dead cat could become a spirit of the ground, or fire, sky, weather and so on. Or it could be more like Starclan where ancestors become stars. Stars, i think, would really help a clan like this(especially if it is nomadic) with navigation. They might come up with a constellation system esp. for deities or ancestors that became renowned and use those to navigate in the winter/summer. This would also give the suffix -star more weight, since a leader is essentially what a star is for the clan. If you like this idea I can write a short description of it later. I also kiind of think the idea of nine lives is rather stupid and can be confusing at points(what decides if a leader loses one or multiple lives, etc) instead i prefer the idea of nine spirits close to that leader guiding him/her/they? They'd only have one life but it gives the leader more of a cultural significance in the clan. Also in the canon books there's little reason for there to be atheistic cats when I believe cats have witnessed leaders dying and coming back to life several times, so there's a more realistic aspect to this approach. Of course, I can still do either. 

That sounds really nice! I'm a real sucker for polytheistic cats.  
What I meant by nine spirits is that they function somewhat like advisers. These cats might have some connection to the leader, but exist with the purpose of giving the leader advice in his/her/their dreams, but not being able to tell the future. They might be able to predict what might happen given that there are the collective memories of nine cats, but not to intervene with mortal life. Of course, given that cats already revere three deities, this might be unnecessary. Although i would like to ask: Would cats give offerings to the gods? Would each cat/family have a different god they like best, or just all three?

With cats leading nomadic lives they'd probably leave early to mid summer for a camp that is out of the way of possible fires, maybe near a water source, I'll specify once I find an exact location. Fire season is generally late summer and ending late fall or early winter when rains might come. However, fire intervals are 10-15 yrs apart(although more frequent,with humans.) but I'm thinking the cats might travel to and from the "home" location and their fire season location every year to prevent unnecessary deaths? Therefore, winter would be the best season to birth kits, while early winter would be best for conceiving them, maybe even late fall depending on when the cats arrive. Cats are pregnant for about 60 days, so they have about two months and then a month or so for the kittens to grow enough to be transported. It would probably be best to conceive them when the cats arrive at their temporary base/fire season location so:

late fall/winter-spring: At fire season location(out of the chaparral), a time of prosperity, likely best to conceive or have kits during this time, though if a cat were to birth them too close to being ready to leave(late spring), the kits would have to undergo a long trip which might not go too well.

Early Summer/late fall- preparation for leaving, a cat could conceive here but a con to this is that the unborn kittens could get injured. 

-small edits to the quote for simplicity-

A better word for founder I think would be Progenitor, since that is what a species originates from. It also sounds much nicer.

-Infighting due to differing favoritism for the deities sounds like great fun, and a nice source of conflict especially if there aren't going to be any bordering clans. I'm thinking there would probably need to be a strong leader to settle disputes and/or keep the clan together as one unit instead of diving along religious lines.

That said, how should the leader/deputy be chosen, and what cats/rank choose a leader if he/she/they are elected/chosen? Would Fire/Rain/Love pick a cat whom they deemed worthy(and if so, how would cats be able to verify this, if the deities aren't fate-altering objects?) Would the leader choose the deputy, or is that the job of the adult cats(ie no apprentices, or kits.) like a voting system? 

I actually really enjoy the names that you've chosen for the seasons! They're really interesting.

I'll go digging around for an area to place the clan in, both of their camps etc. For organization's sake, would you mind if I combined allegiances(including Cat Heaven/starclan/whatever name we have for that?), the prefix/suffix list, genetics(because I for one, really enjoy realistic kitties, although if you really do not I will scrap this.), a map of the territory/camp, and medicine into one spreadsheet? like this? It'll keep the introductory posts shorter and is probably easier for people to reference if they need to do so, instead of scrolling up and down the page for a specific source. 

For a religious code/rules, are we just going to stick to the plain old warrior code? (minus a few if they don't border another clan.) or will we need to construct a new one?