I really can't think of a more undervalued coin than Lethean.
It's a privacy coin. It's comunity driven. It has a working product behind it (VPN).
Well, I guess I was right, it just went up 400% today...

It is a privacy coin, however, its use case is limited as it is only available in couple of exchanges. And the problem is, those exchanges are not really very popular among traders. So it is quite difficult for the crypto user/trader to utilize its feature as a privacy coin because you can't find it in major exchanges. Also, I believe, its community is not that big yet. Maybe, if the team has funds to conduct bounty campaigns, they should try it. At least, expose their coin and sell their privacy feature.