DoctorSpooge's advice is sound. I wouldn't bother 6*'ing any of those either, with the benefit of hindsight. He mentioned several worth going for in SDs, but let me add Light Inugami to that list, in case you see one pop up. Honestly if your first three 6*s were Light Bearman (runed for 100% critical), Light Vagabond, and Light Inugami, you'd be ahead of 80% of the population in both arena prowess and farming. Eventually you'll get a 4* worth investing in, and before you know it you'll have too many different things to focus on and wonder what happened to the days of your warbears.
If you honestly don't get anything and are sitting there with nothing to do, Fire Inugami has the longest usefulness. A lot of people love Ramagod (Wind Warbear) but he's a one-trick pony in my eyes, and is absolutely worthless for anything but farming (which many of the others can do as well) and maybe some Arena Offense. If I see ANY warbear on Arena Defense, it is almost a guaranteed victory because I can ignore it until everything else is dead; it is far too slow and weak unless it gets a Clean Shot off, and at worst you lose one monster to it and then kill it.
Same goes with Water Epikion Priest, which you didn't mention but deserves a warning as well. It *seems* like a fantastic defense, but again all anyone ever does is ignore it until everything else is dead and hit auto until she dies too. Sure she might ward off some arena attacks during low levels, and she might even win you some matches, but if I had it all to do over again i would have foddered her, and never wasted all those other 3* priests to level up her skills.
Which is another subject that someone mentioned a couple weeks/months ago in this thread. It may seem like a good idea now, but anything 3* or higher, don't ever just feed it to something to level up skills. If you have your Fire Inugami, for instance, which is currently at 4* from your list, and want to feed it a bunch of other Inugamis...level those all to 4* first, then when your Fire is ready to evolve to 5*, use four of those other ones as evolving material. And then if you decide to 6* it (I wouldn't), level up five more to use as fodder as well. If you aren't spending money, you will run out of fodder much faster than you realize later on, and you'll wish you had all those back. Sure, it seems slow at first, but trust me. However, I probably wouldn't use too many of those until you got something truly useful like a Light Inugami, but I realize you do need something at early levels, so Inugamis aren't really that hard to come by, might as well use them.
Oh, and I haven't touched my Light Fairy since they nerfed the Giants team (DoctorSpooge is correct, imp team isn't really viable anymore...well it can be, but not worth your time), so I wouldn't go out of my way to get one if I were you. She can be useful early on though, so if you get a chance might as well grab it.
Really you are just waiting for a couple good 4*s (and 5* if you get really lucky). Feel free to ask here, or join the Line group, to make sure anything you get is worth your time. In the meantime, get some of those mentioned above, max out your Fire Inugami as a 5* and team it with your two warbears for now, and anything else just level them to 5* level 1 so you can use them as fodder for 6*s later on. You'll be glad you did.
If you honestly don't get anything and are sitting there with nothing to do, Fire Inugami has the longest usefulness. A lot of people love Ramagod (Wind Warbear) but he's a one-trick pony in my eyes, and is absolutely worthless for anything but farming (which many of the others can do as well) and maybe some Arena Offense. If I see ANY warbear on Arena Defense, it is almost a guaranteed victory because I can ignore it until everything else is dead; it is far too slow and weak unless it gets a Clean Shot off, and at worst you lose one monster to it and then kill it.
Same goes with Water Epikion Priest, which you didn't mention but deserves a warning as well. It *seems* like a fantastic defense, but again all anyone ever does is ignore it until everything else is dead and hit auto until she dies too. Sure she might ward off some arena attacks during low levels, and she might even win you some matches, but if I had it all to do over again i would have foddered her, and never wasted all those other 3* priests to level up her skills.
Which is another subject that someone mentioned a couple weeks/months ago in this thread. It may seem like a good idea now, but anything 3* or higher, don't ever just feed it to something to level up skills. If you have your Fire Inugami, for instance, which is currently at 4* from your list, and want to feed it a bunch of other Inugamis...level those all to 4* first, then when your Fire is ready to evolve to 5*, use four of those other ones as evolving material. And then if you decide to 6* it (I wouldn't), level up five more to use as fodder as well. If you aren't spending money, you will run out of fodder much faster than you realize later on, and you'll wish you had all those back. Sure, it seems slow at first, but trust me. However, I probably wouldn't use too many of those until you got something truly useful like a Light Inugami, but I realize you do need something at early levels, so Inugamis aren't really that hard to come by, might as well use them.
Oh, and I haven't touched my Light Fairy since they nerfed the Giants team (DoctorSpooge is correct, imp team isn't really viable anymore...well it can be, but not worth your time), so I wouldn't go out of my way to get one if I were you. She can be useful early on though, so if you get a chance might as well grab it.
Really you are just waiting for a couple good 4*s (and 5* if you get really lucky). Feel free to ask here, or join the Line group, to make sure anything you get is worth your time. In the meantime, get some of those mentioned above, max out your Fire Inugami as a 5* and team it with your two warbears for now, and anything else just level them to 5* level 1 so you can use them as fodder for 6*s later on. You'll be glad you did.