Imo, probably the best ally out there is the Jwari Shapeshift, as it can become ANY active ally you control. For only two mana, you can copy some of the 4+ mana baddies and do a lot more damage. Also, you do not seem to have allys that work well together. With my RL ally deck, the milling one on my profile, I like the combo of sea gate loremaster, with harabaz druid. I draw more allies with loremaster and have a lot of mana with my druid to play more at once.
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Imo, a good combo to run with a red ally deck, is Murasa Pyromancer and Kazuul Warlord. Whenever you summon an ally you can deal damage to a creature equal to the number of allies. I like that more than the Flame Slash because it is more consistent. The Warlord is great for pumping up all your main attackers to hit harder. Summon an ally, ALL allies get +1/+1.
I have another Ally deck on my profile. It is my one with Kazuul. I am going to get the Loremaster tomorrow. I do like my green not only for my druid, but for naturalize. It is very common to find enchantments or artifacts that can screw me over. Example - Journey to Nowhere, Oblivion Ring, etc.
I really like the whole, "If you loose a 1/1(example) from play put him back on yourside of the field." with Gravepact, you can sacrifice for Carrion Feeder, kill one of his creatures, bring it back. Quite nice imo. Clean setup
The splash of green for the druid is why i like it. Since I mainly have white creatures with a the main blue, it is useful to pull out a bunch of allies at once. I won on turn five three times in one day with the help of the druid. I had 3 Halimars and Two Jwari with one druid. Only had a seaside citadel and a glacial fortress(for some reason.) Used the druid to use Join The Ranks. thats 8 cards, 10 times(I can explain if need be)