Constructs are the living creations of Mad Science.
They fall into several general categories, usefully analyzed and described by Karrion of the GG Yahoo Group:
Type I: Revives - dead, brought back to life. I guess we can't punish Victor for bringing Sparky back from the dead.:Examples: Tarvek Sturmvoraus; Agatha Heterodyne; The shell of Madame Olga may qualify; Zulenna Luzhakna may or may not have been successfully revived. Rudolf Selnikov's head has been revived, which seems to place him in this category, but perhaps his makes him a 'Borg - Type XI. If he ever gets that , presumably he will become a Patch job - Type II.
Type II: Patch jobs - dead, repaired with spare parts, brought back to life. They'll fix you. They fix everything.:Examples: Baron Klaus Wulfenbach
Type III: Frankensteins - built from parts of dead, brought to life. LIFE! DO YOU HEAR ME? GIVE MY CREATION... LIFE!:Examples: Punch and Judy - not confirmed in the comic, but in the novel.
Type IV: Freaks - never dead, parts surgically added. Smithers, fetch some surgical tools... and some ether...: Examples: Boris Dolokhov
Type V: Hydes - altered by some process: Here, drink this.: Examples: the Jägerkin
Type VI: Anthros - animal forms with human level (not that THAT means much) brain power. ...that is the Law. Are we not Men?: Examples: Krosp I
Type VII: Scratchbuilds - new, never-before-seen forms of life.: Examples: Zoing (possibly); most of the monsters of Sturmhalten's sewers
Type VIII: Sideshows - not much different. Extra large or small; minor alterations such as added horns or abnormal color, i.e. unicorns or pink cats. One of us! Gooble gobble, gooble gobble! One of us! One of us!: Examples: Mimmoths, Lapinemoths, the Monster Horse Beastie
Type IX: Borgs - clank-construct combos. We can rebuild him. We have the technology. We can make him better than he was. Better...stronger...faster.:Examples: Wasp weasels, Snapper Boikov, Radioheads,
Type X: Hybrids - construct falling into more than one basic category, i.e. type IV/VI.:Examples: Klaus may instead be a type II/III; the wasp weasels may be VIII/IX.
Type XI: WTF - catchall for every thing that DOESN'T fit any category.:Examples: Not known, but Von Pinn, the Hoomhoffers, the Lackya, and the slaver wasps are not conclusively categorized.
Type XII: My mistake...- For the rare case of being commonly mistaken for constructs, but aren't. Aliens/extradimensional beings would qualify as well as when mother nature shows her sense of humor to fleeing townsfolk who have heard of, say, t-rex dinosaurs who were just brought in thru a time portal. Of course, some of these categories are subject to speculation and the conflicting classification systems of their creators. Keep an eye on Category:Constructs and the inhabitants thereof.