I dont think that there is just one oldest card they all came out at the same time i know Baby Q was original and i froget if charile was or not.

The first Card/Clans on Urban Rivals.

Bangers (10) +2 Power
- Bodenpower (U) 5* (7/7) -5 Opp. Attack, Min 2
- Chikko (C) 3* (4/4)
- Juicy Lord (U) 3* (6/4) - 2 Opp. Damage, Min 2
- Meroo (C) 2* (5/2)
- Platoona (C) 4* (7/5)
- Saddy (R) 3* (5/5) Stop Opp. Bonus
- Sum Sam (C) 5* (6/
- Syd Noze (C) 3* (3/5)
- Tunned (C) 3* (3/4)
- Vermyn N (U) 4* (5/7) - 4 Opp. Damage, Min 1

Fang Pi Clang (11) + 2 Damage
- Kinjo (U) 5* (6/5) + 3 Damage
- Lao (C) 5* (5/8 ) Stop Opp. Bonus
- Lihoi Chun (C) 2* (4/3)
- Lost Hog (C) 5* (5/8 ) -5 Opp. Attack, Min 5
- Macumba (R) 4* (7/5) -5 Opp. Attack, Min 5
- Natrang (C) 3* (4/4)
- Otome (C) 3* (3/5)
- Sai San (U) 4* (3/7) - 1 Opp. Damage, Min 3
- Tatane (C) 3* (3/5)
- Windy Mor (U) 3* (6/4) Stop Opp. Bonus
- Xia Leming (U) 3* (6/4) - 2 Opp. Damage, Min 2

GHEIST (5) Stop Opp. Ability
- Brutox (C) 3* (5/4)
- Lilith (C) 3*(5/4)
- Meyen (C) 3* (7/3)
- Morlha (C) 2* (2/4) Stop Opp. Bonus
- Sigmund (U) 4* (2/8 ) -5 Opp. Damage, Min 3

Junkz (10) + 8 Attack
- Acid DC (C) 3* (3/4)
- Akiko (U) 3* (2/5) -1 Opp. Damage, Min 2
- Berserkgirl (C) 3* (5/4)
- Brandon (C) 3* (4/4)
- Bunny (C) 4* (3/8 )
- DJ Korr (R) 5* (8/8 ) -3 Opp. Damage, Min 1
- Keanew (C) 3* (6/4) - 6 Opp. Attack, Min 3
- Malmoth (U) 4* (7/5) - 4 Opp. Attack, Min 4
- Nobrocybix (C) 2* (1/5)
- Otakool (U) 3* (6/4) Stop Opp. Ability

La Junta (10) +2 Damage
- Amiral Py (U) 3* (5/5) -5 Opp. Attack, Min 2
- Bruce (C) 3* (8/3)
- Flavio (C) 3* (1/8 )
- General (U) 5* (7/8 ) Stop Opp. Ability
- Gertrud (R) 4* (6/6) Stop Opp. Bonus
- Jane Ramba (U) 3* (7/4) - 2 opp. Damage, Min 1
- Mitch (C) 3* (5/4) Stop Opp. Bonus
- No Nam (C) 5* (7/7)
- Wardog (C) 2* (8/2)
- Winifred (C) 4* (4/6)

Montana (10) -12 Opp. Attack, Min 8
- Aldo (C) 3* (4/4)
- Don (U) 5* (6/8 ) -4 Opp. Attack, Min 2
- Flesh Pimp (U) 4* (2/8 ) -5 Opp. Attack, Min 2
- Lino Borsa (C) 3* (3/4)
- Lyse Teria (U) 3* (8/4) Stop Opp. Ability
- Mort Bax (C) 4* (4/7)
- Ottavia (C) 3* (7/3) - 2 Opp. Damage, Min 2
- Pino (C) 2* (6/2)
- Vickie (R) 5* (7/8 ) Stop Opp. Bonus
- Zodiack (C) 3* (2/6)

Pussycats (10) -2 Opp. Damage, Min 1
- Baby Q (R) 4* (6/6) Stop Opp. Bonus
- Charlie (U) 5* (7/8 ) -2 Opp. Damage, Min 1
- Gwen (C) 3* (7/3)
- Dolores Boss (C) 3* (5/5) - 5 Opp. Attack, Min 2
- Ninja Nyne (C) 3* (3/8 )
- Noon Steevens (C) 3* (6/4)
- Shawoman (C) 3* (2/6)
- Tania (C) 3* (2/6) Stop Opp. Bonus
- Wanda (U) 2* (8/2)
- Yayoi (U) 4* (7/6) Stop Opp. Ability

Roots (10) Stop Opp. Ability
- Ataoualpet (C) 3* (3/4) -5 Opp. Damage, Min 5
- Billy Bob (C) 4* (6/5)
- Kiki (R) 5* (8/8 ) -4 opp. Attack, Min 1
- Narendra (C) (6/4) - 5 Opp. Attack, Min 5
- Ndololo (U) 4* (5/6)
- Noodile (C) 3* (8/4)
- Ogoun Kyu (C) 2* (1/6)
- Ratanah (U) 5* (8/5) - 4 opp. Attack, Min 4
- Sunnygoat (C) 3* (2/6)
- Yaman (U) 3* (4/4)

Sakrohm (10) -8 Opp. Attack, Min 3
- Aldebaran (C) 3* (4/4)
- Caciope (C) 3* (7/3)
- Gastroboy (U) 4* (4/7)
- GraksmxxT (R) 4* (8/5) - 5 Opp. Damage, Min 1
- Guru (U) 5* (8/7) Stop Opp. Bonus
- Halley (C) 2* (4/2)
- Oryon (C) 3* (2/6)
- Pulsar (C) 3* (2/7)
- Uranus (U) 3* (5/5) -5 opp. Damage, Min 1
- Venus (C) 4* (6/6)

Sentinel (5) + 8 Opp. Attack
- Aurelia (C) 2* (7/2)
- Copper (U) 5* (4/8 ) + 5 Power
- Josh (U) 3* (3/6) Stop Opp. Bonus
- Rebecca (C) 2* (6/3)
- William (C) 3* (5/4) - 4 Opp. Attack, Min 1

Ulu Watu (10) + 2 Power
- Chad Bread (C) 3* (5/5)
- Gaia (R) 3* (7/4) - 3 Opp. Attack, Min 1
- Mac Hen (C) 3* (2/5)
- Nanook (U) 3* (8/4)
- Rass (C) 3* (4/4)
- Razor (C) 4* (4/6)
- Sandy (C) 2* (2/4)
- Tafa (C) 3* (3/5) Stop Opp. Bonus
- Tanaereva (U) 5* (8/7) - 2 Opp. Damage, Min 2
- Wee Lee (U) 4* (7/6) - 2 Opp. Damage, Min 1

Uppers (11) - 10 Opp. Attack, Min 3
- Armanda (C) 3* (4/4)
- Bob Joby (C) 2* (1/6)
- Dorian (U) 5* (8/7)
- Elliott (C) 2* (4/3)
- Frankie Hi (U) 3* (6/4) - 3 Opp. Attack, Min3
- Gina Glitt (C) 3* (1/8 ) - 4 Opp. Damage, Min 2
- Jackie (R) 4* (8/6) Stop Opp. Ability
- Maeva (C) 3* (3/5)
- Mo DiFalco (C) 3* (4/5)
- Zatman (U) 3* (8/4) -4 Opp. Attack, Min 1
- Zlatar (C) 4* (3/8 ) Stop Opp. Ability

Thanks to MasterfuI for the list.

If the ID of the oldest cards truly represents their release order, then Natrang is the oldest character in Clint City, and non-cr too.

This would be some of the oldest, in order of id.

Natrang
Sai San
Tatane
Nanook Cr
Akiko
Berserkgirl Cr
Pino
Lino Borsa
Keanew
Brandon
Gertrud
Mitch
Wanda
Ataoualpet
Tafa

I.e Team Chman art cards

All the "original" cards are the ones drawn by Team Chman. Those are all from about the same time in 2004, before UR could be played on desktop computers.

Fun fact: Sentinel and GHEIST were not originally in the game but added later on.

@Memento
This isn't like when Euzebe mistakenly listed Marco as a Cr in an eloban list and he went Cr anyway and now you told us that Nanook Cr is due to happen one of there days?

I thought Sentinel & Nightmare are the oldest, according to UR comics which I read & love them.
How they introduce the characters to fit in the story and how Kolos almost destroyed the Clintz City!