This is my personal builds for Janna, Warwick and Galio.

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Janna:
With Janna i mostly play with high speed and short cooldown so that I can runaway quickly from ganks and to be quick and hard to catch in gang-fights, also so that I can cast my gale, zephyr and shield often so i can both get away easily and have a greater chance to survive.

Galio:

Warwick DPS:

Warwick Off-Tank:

Janna:

You can, if you like, swap the Banshee's Veil for some AP item instead or some other item you like. I would recommend some of these three items:
Abyssal Scepter, Rylai's Crystal Scepter or Zhonya's Hourglass.
But if you are in need of Banshee's Veil i suggest you should keep it!

Galio:

After you have bought Banshee's Veil I sell my Tear of the Goddess and buy Glacial Shroud and then Frozen Heart.

Warwick DPS:

Warwick Off-Tank:
The items always depends on which opponents you are facing, if you are facing lots of DPS you need much armor and not much magic resist and vice verse.

Janna:

Galio:

Warwick DPS:

Warwick Off-Tank:
Since I'm a big fan of dodge I've got a lot of dodge runes, it's really irritating as opponent when the target dodges, and 23% dodge chance is a really high amount, so you will for sure irritate your opponents! If you also spec the Nimbleness mastery you also get increased movement speed when you dodge an attack, so you can easily run away, if you need to. I have only armor Marks since they got the best armor value, and the Glyphs is maxed with magic resist, for the same reason.

General tips:

Janna:
Always cast the shield on the DPS or someone you know do much area damage in the beginning of gang-fights. And if you are near someone who is going to get a kill, give him a shield too, cause it always gives assists!

Galio:
Always cast the shield on the DPS or someone you know do much area damage in the beginning of gang-fights. And if you are near someone who is going to get a kill, give him a shield too, cause it always gives assists!
When you use your ultimate a good thing to have in mind is that every attack increases the damage dealt, so if you are able to get in some minions around you they will attack you and your ultimate will easily be maxed!
Oracle's Elixir is very good to have if you are facing Teemo, Twitch, Evelyn or Shaco, because that will give you full sight of them when they are invisible and near you. Since you are tank and won't easily get killed you have the most value of it.

Warwick:
Always give your Hunter's Call to someone you see can get a kill, and of course always in gang-fights so your team get more attack speed, since that also brings assists!
Always use Hungering Strike when you have low life, if you are running from an opponent and you run past a minion or monster you just take a bite and keep running, if your are really fast you wont even stop running, and that will often save you from fights!
As often as you can you should take the blue-buff!