First! I would like to be one of the first to welcome you back!!

There are definitely quite a few great ninjas available. In my opinion, if you are looking to piece together a ninja, both Edo Tensei Hiruzen and Kakashi [Susano'o] are great options. Sarutobi Hiruzen [Edo Tensei] can be used as the Pos 1 damager or support. While Kakashi [Susano'o] is mainly used as support and excels well with ninjas that are from Konoha.

Here are some good lineups made by Jori for Sarutobi Hiruzen [Edo Tensei]: Click Here

Here is a post made by the community with some lineups for Kakashi [Susano'o]: Click Here

Those "Explosive Heart Gift Packs" and "Hot Blooded Sports Games" costume is also very good.

Earth Grudge Kakuzu and Edo Tensei Deidara are ninjas that definitely hold their own in battle.

Here are a few lineups by Jori for Kakuzu [Earth Grudge Fear]: Click Here

Here are some Deidara [Edo Tensei] lineups by DareDev1L: Click Here

Please note that the builds above are just as reference. There are definitely many more builds out there and maybe even better ones =p You have the power to make and choose the lineup you want and works for you.

Costumes are always a good choice to get as it gives you stats and Power. Just depends on if the price is right for you =]

Hope this helps!

~Jib