I'll make one as well, so that your Knight-That-is-not-a-Knight isn't the only odd one!

Name: Lime
Class: Jelly-Knight
Looks: Any armor (starts off in a Modified Vita-Suit - See background), glowing Lime-Green in color. Has no "eyes" but rather uses bubbles within its "head" to replicate them.

Background: During a field test using experimental bullets in a raid on the Royal Jelly Palace, it was discovered that hitting Jelly Green Mini's with the bullets caused them to pool together. The pool was thought to be disposed of, and the project was scrapped. Little did the knights know that the Green pool was capable of absorbing parts of armor and morphing into a knight-like Jelly, starting with some spare parts and a Vita Suit. This is how Lime came to be. The chemicals in the bullets gave Lime the capability to thinking above simple "Glorping", and onto more complex thought processes, such as "What shall I eat today?", along with a resistance to Shadow attacks. Lime is not strong enough to take on the Knights by itself in order to steal armor, and so picks up scraps lying around their base and further down to the core, searching for better and easier to obtain equipment to consume. Lime is fully accepted by Jelly kind, but would rather seek new things to eat than stay around guarding a palace.

Personality: A bit of a glutton, and brutally honest. It means no harm through its honesty, but can get in trouble because of it. Knows a lot about Jelly Culture and as such, can communicate with them freely. Would do anything for food/equipment.

Abilities: Capable of absorbing most hits with little to no damage, including shadow attacks. Capable of using Barb Shot like a Polyp and Thorn Attack like a Jelly. Can absorb pieces of equipment and mold them together to be used in combat. Lime can also rally smaller Jellies to aid in attacking.

Light-dark corrupt knight? That will be cool!

Corrupton

Class: Well balanced
Looks: A corrupt-holy appearance, robot looking.

Backround: Born as an undead-construct hybrid, he was born with a corrupt mind, seeking for light. He eventually left Vanaduke's army and traveled upward to the light and surface. He did not reside there for long, and went back underground, but not before the light seeped into his body. The darkness of the deep and the light of the heaven created Corrupton, wielded powerful weaponary unknown to knights but with a kind and gentle heart.

Personality:
A kind and gentle robot, however the corruption can sometimes cause him to accidentally hit teammates

Abilities: Can heal itself with life crystals found within the clockworks, restoring a bit of health based on the strata it was found in. Can also use mana (max 50 mana) to use special attacks explained in the loadout section (oh, he should consider that too)

Loadout:
WARNING! non of these weapons are actually found in spiral knights and are for RPing purpose only
Greatblade edge:
A rather large sword looking like the divine avenger and gran faust combined, a shadow hilt,guard and normal sword, with the light outside.
Special: Jump into air, spin briefly and then crush down with the sword, creating a massive earthquake dealing large amounts of damage, knocking enemies back. Can sometimes fail causing a rather large damage to itself (40 mana)

Doombringer:
A senteza with a few tweaks, such as vanaduke army symbol and speed attacking
Special: Like senteza but it shoots 9 bullets, the bullets hiome and final bullet is a rapidly growing shadow orb that deals damage multiple times.Can fail, like greatsword(25 mana)

Dark's bane:
A holy looking ticking bomb that can release a mist cloud inflicting frostburn and dealing a large amount of damage.
Special: Charges and places a bigger bomb that takes a longer time to blow up but has a bigger cloud and time, with more damage. Will inflict status on itself if within blast range.(30 mana)

Note: Mana regens over time

TL;DR
A corrupt-holy robot with special attacks and MANA!