Note:
The Sparkbots are clear repaints of the Eggbot keychains released in Japan during the Beast Wars II era. They should not be confused with the Sparkabots from the G1 toyline.
The Sparkbots were released as a three-pack. The packaging included a KissPlayers timeline, a trading card with bios of the Sparkbots, a CD, and a booklet that included lyrics to the Transformers theme, transformation instructions, and a Making Of Sparkbot segment showing the original designs and notes made by the three voice actresses as they designed the decos and "personal marks" of the three Sparkbots. Lyrian (designer for Angela) included notes explaining her name choice. Yui Kano (designer for Zangetsu) included a detailed bio. Satomi Akesaka (designer for Stardust) did not opt to include any text on her design sheet.

From the trading card:
Sparkbot
Function: Shikigami (supernatural spirits that can be summoned like familiars to do one's bidding)
Alt-mode: Spark
Ability: These three floating spheres suddenly appeared before the Kissplayers and telepathically declared themselves to be "Servants of Primus". Normally, they are in the form of mysterious spheres called "Sparks", but when the KissPlayers -- thought to have lost their abilities -- kissed them, Angela, Zangetsu and Stardust become Transformers, and are able to traverse space and time.
Their goal is to use the KissPlayers' powers to gather together the "Fragments of the Allspark", which were scattered across time and space due to an unspeakably powerful supernova explosion. If the Fragments of the Allspark are not gathered, the chain of events in history will be broken, and "the future" will never happen. What is the Allspark? Who is Primus? Right now, a time travel journal that surpasses Universe is beginning.

Personality: They always act as one, as though they had once been a single unit. But each of them has a different way of thinking based on their individual consciousness, and these differences allow them to choose their next actions.

Weapon: Gamma Ray Burst.

Stats:
Strength: 3
Intelligence: 10
Speed: 9
Endurance: 2
Teamwork: 9
Courage: 3
Firepower: 7
Skill: 7

From Lyrian's design sketches:
Lyrian's Design: ANGELA
"Although it's often used as a personal's name, originally it meant "Angel" in Italian.
To go with her name, I put angel wings on her mark."

From Yui Kano's design sketches
Character name: Zangetsu
Function: Ninja
Personality: He tends not to stand out, and he is easily embarassed and has difficulty talking to others. However, he has more knowledge than anyone else, and he is quite chatty. As a result, he is always talking to himself inside his heart.
Perhaps as a result of this personality, his current job is ideal for him, and he is the best of his comrades at aerial attacks.

Layout elements from CSSplay.co.uk and Mari's IROEMPITSU