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Harry Potter: Quidditch Champions

Microtransactions in Harry Potter: Quidditch Champions are summarized as...

The game proudly claims not to offer microtransactions, and their FAQ section states there are no plans to include any.

The game offers a "Deluxe" pack. This pack contains in-game cosmetic items for each of the 4 houses. Additionally it includes 2,000 "Gold", which is a currency that can only be earned through in-game activities. There are no premium currencies of any kind.

Owning Hogwarts Legacy and connecting it to your online account will reward you cosmetics in this game.

Additional cosmetics could be earned by pre-ordering the game and by connecting your account to a third party service.

Additional content for the game is expected over time through seasons and events. If and how these will be monetized is yet to be seen.

Features unique cosmetic rewards for pre-ordering the game.
Has a "deluxe" edition of the game which features (almost) nothing but in-game cosmetic items.
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There are no additional purchases other than a "deluxe" version of the game. No microtransactions, no DLC.