Ridley (SSBU)/Down throw
Ridley slams the opponent to the ground. Down throw is an extremely strong combo tool at 0%, as it doesn't send into tumble until around 18.4% on average. Due to this, as well as it being a throw, the opponent cannot interact with DI or even ASDI. Ridley removes all interaction bar their option out of hitstun, enabling every combo at this point to be consistent.
Down throw can be used to set up for Skewer, which catches panic airdodges. However, waiting and using shield can prevent this and leave Ridley at -29 on shield frame advantage. Most Ridley players will use a full momentum short hop fast fall neutral aerial to try and regrab, or forward aerial for its high damage with a tipper while being able to combo into itself. Both of these combo routes should end with the opponent at around 50%, giving Ridley a fair opener.
Down throw can be confirmed through moves such as landing forward or neutral aerial, or a half-charged Plasma Breath (which has less endlag than a fully charged one). However, the latter tends to leave the opponent out of the tumble percentage range, which can make it more difficult to get a good combo.
With the assistance of platforms, down throw can also KO at higher percentages. This is Ridley's main kill throw in circumstances where it's necessary.
Optimal DI is a 314° angle on the control stick.