Star Ace/X-Plus is a Japanese toy company that makes toys based on many Japanese as well international characters.
X-Plus makes one of the largest lines of kaiju vinyl figures. X-Plus has their 30cm Series (30cm scale), Large Monster Series (25cm scale), Gigantic Series, and their Real Master Collection (poly resin "statues"), as well as other series. There are usually two version of many figures, a standard version, and a Ric Boy Limited version that is sold direct from X-Plus and features extra features and/or accessories.
Star Ace is an international division (sister company) featuring licenses that X-Plus can't, their figures come in standard (NX) and deluxe (DX) versions normally. This section features newer figures from a few different lines unrelated to the other sections.