|Prototype Model Unit XJ-2|
|Age||Unknown (Older than XJ-9)|
|Occupation||Superhero/crime fighter (When awake)|
|Likes||Helping people, saving the world|
|Dislikes||The Cluster, Smytus, blasting uncontrollably|
|Family|| Nora Wakeman (creator/mother)|
XJ-1 (early prototypes/sister), XJ-3, XJ-4 , XJ-5, XJ-6, XJ-7, XJ-8, XJ-9 (later sisters)
Wisteria Wakeman (aunt)
Glenn Wakeman (cousin)
|Friends||Brad Carbunkle, Tuck Carbunkle|
|First appearance||"Sibling Tsunami"|
Prototype Model Unit XJ-2 is an XJ prototype robot that works as some sort of a ray gun; her biggest defectivity is that she suffers from hiccups and accidentally shoots plasma beams out of her nozzle-like mouth.
- Sibling Tsunami (Her first appearance)
- Sister Sledgehammer (She, along with XJ-4 are the first two XJ robots to be absorbed by the Cluster-possessed Jenny but is later freed)
- Agent 00' Sheldon (No Lines)
- Escape from Cluster Prime (Brief Cameo)
- Labor Day (Brief Cameo)
- She doesn't talk, but seems to indistinctly utter the word "hiccup!" when she shoots out her rays.
- She is reminded in Sister Sledgehammer to hold her breath so she won't blast anyone she's not supposed to blast.