LEGO Creator and Ninjago Mechs, three sets.

This is three different LEGO Creator and Ninjago mechs, with one set, the white, orange, and gray one in the back, being a complete, official build. The others are likely alternate builds or custom creations (MOCs) using pieces from various sets.  Identified Sets and Creations  Top Mech: This is the primary build from the LEGO Creator 3-in-1 Space Mining Mech (31115) set. This set allows builders to create three different models from the same bricks: the space mining mech, a four-legged cargo carrier, or a two-legged robot. The main model includes a spinning buzz saw, a jetpack, and a face with changeable expressions.  Bottom Left Mech: This red, black, and yellow mech appears to be an alternate or custom build. The colors and parts suggest it may utilize elements from a set like the LEGO Creator 3-in-1 Super Robot (31124) or a LEGO Ninjago set like the Fire Knight Mech (71846), although the exact build is custom.