Unfortunately he was only attainable as a login champion between July and October of 2021. 

I do hope that Plarium brings back a way for people to get these limited champions at some stage.  Ninja in particular is very useful for players, so it would be good to add to the shards at some point

Tbh no champ should be unobtainable ... makes way for account selling ....

In btw the best way to get ninja currently is to buy an account which has him ... says a lot about how to get specific limited time champs and why they should still be available ...

I agree with the statement that NO champion should be Unattainable. Its Mean to be quite  honest :/

So if Ninja appeared  in the Token trader.....well at least thats a fair  option for players ;)

It gets a bit more complicated when it's a champion based off an actual person and likeness, rather than a fictional one.

Unfortunately, I would not expect to see Ninja back in any form.

Fairly sure he can be summoned from shards, no?

when you select the summoning  portal there is a list of champions that cannot be summoned from any shards and Ninja is listed there :/

Oh wow. Yeah, I just looked, and there are several that can't be summoned. That's really quite surprising. Why is that limitation there, Plarium?

Ninja is based on a real life cc.  Made a promotional deal with plarium.  He brings them his adoring followers.  They give him money. Licensing.  Deal was a one time promo so contracts, legal, limitations, etc.  I think Alecks was a similar deal.  Plarium is contractually prohibited from allowing more Ninjas under the agreement.  In essence, it would cost them a lot of money to do so, but would not bring in significantly more new players, as they have already farmed his following.

Fair. But very unfortunate for newer players.