References

Blackjack
Design: Parts of Blackjack's design includes a scar on his left cheek, it's similar to that of Dragon Ball Z's Bardock [[File:Scar.jpg|thumb|220x220px|Bardock's Signature Scar

]] Personality: Blackjack shares many different personality traits with anime characters, including Goku, Piccolo, Bardock, Vash The Stampede and Edward Elric

Attacks: Blackjack's Blue Gaster Cannon is reminiscent of the Kamehameha technique

Weaponry: One of Blackjack's weapons is a giant gun in the shape of a cross, this gun aptly named "The Punisher" is a reference to the gun of the same name used by Nicholas D. Wolfwood in the anime Trigun

Quotes: Blackjack once muttered "There's a shortage of perfect breasts in the world, it'd be a pity to damage yours" which is something Westley said in "The Princess Bride"

Weaponry: In the Underfell Universe Blackjack wields two long swords named "Sin" and "Salvation" similar to the swords wielded by Azrael in the DC universe

Name: Blackjack Edward Alphonse Sanchez Dreemur Ventura, Blackjack is a font and a play on his power, Edward and Alphonse are a reference to Fullmetal Alchemist, Sanchez is a reference to Rick and Morty and Ventura is a reference to Ace Ventura: Pet Detective

Serif
Backstory: One of the posters that show Serif on it has a bounty for $60,000,000 which is a refrence to Vash The Stampede's Wanted posters in Trigun, where his bounty is $$60,000,000,000

Quotes: Serif said "Life IS Pain, Highness Anyone who says different is tryin' ta sell something" which is the same thing The Dread Pirate Roberts said during the 1987 movie "The Princess Bride"

Edward
Name: He was originally called Future Jay, one of many direct references to his inspiration, Future Trunks

Design: He wears a dark blue jacket, white tank top, black slacks with a golden stripe down the side and golden boots with two black markings on them, his design is based off of Future Trunks

Backstory: Edward first came back to the past to give his father heart medicine, and to meet his family, as well to warn them of a coming threat, very similar to Future Trunks, where he came back to give Son Goku heart medicine, meet his father Vegeta, and to warn them of a coming threat (The Androids).

Weaponry: Edward's main weapon of choice is a longsword, similar to Future Trunks' weapon of choice, a sword.

Personality: Edward is rather smart and fast, but also being rather arrogant, this is a direct reference to Vegeta, another Dragon Ball Character.