Demoman

Demoman is a starter-shop tower. Older tutorial objectives suggested the tower was a triumph reward; the tutorial article says players actually bought Demoman with coins from the tutorial, and that payout itself was later removed when the tutorial moved into Boot Camp.

Store purchase for 200 Coins.

A 200 Coin splash tower is a normal early purchase once Scout and Sniper are not enough for grouped enemies. Confirm the price in the store before you buy.