The best character is actually relative, depends on what skill you want
Here are characters with the highest skill:
1. BONUS GAME
A/A+ : SANTINO, TARANTULA, FRANCESCA - Optional : RICHARD WU , SALLY
S: MARINANO
If you like to have character with high bonus game skill (in order to win a lot of bonus game), it's the best if you have santino because santino is the character who has the highest bonus game skill
but i don't recommend santino because santino has low dice control
What i mean is, even if we want to have character with high bonus game, we need to see the other skill as well.
To be more understand i suggest you see tips & trick to win part 1
So if you have santino / tarantula / francesca its better if you choose tarantula / francesca over santino - its more better if you have S card mariano
Recommended Dice : Rainbow, Treasure Box or Metal Rear
Recommended Pendant :
A/A+ : Richard Wu's Trump Card, Tarantula's Laser Gun (for space map)
S : Golden Lucky Pig, Bull Fighter's Sword (for Thailand map)
2. DICE CONTROL
A/A+ : HYENA, RICHARD WU, APPOLON, FRANCESCA - Optional : TARANTULA, ARA
S : ALL S CARDS
The reason why you need to choose character with high dice control see tips & trick to win part 1
I recommended Hyena for A / A+ class or S cards if you have
Dice recommendation : Star Fall, Treasure Box, Colorful, Space, LED
Pendant recommendation :
A/A+ : Scratched Record (from MAX Justin)
S : Top Racer's Helmet (from MAX Christine)
3. CHEAP BUILD / ACQUIRE DC
Cheap Build
A/A+ : APPOLON, WHITNEY, CONY THE SUPERSTAR
S : ALL S CARDS
Acquire DC
A/A+ : HYENA, TARANTULA, WHITNEY, FRANCESCA, CONY THE SUPERSTAR
S : ALL S CARDS
If you want to win by buying hundreds of buildings and buy building as cheapest as you can. These skill's are perfect for it! The characters who has highest cheap build and acquire dc are WHITNEY and CONY THE SUPERSTAR
Dice recommendation : Rainbow, Star Fall, Colorful, Space, LED (has both skill)
Pendant recommendation : None, you choose
4. GOLDEN CHANCE
A/A+ : HYENA, ARA, ARIANE - Optional : APOLLON, RICHARD WU
S : ALL S CARDS except YURA - Recommendation : EDWARD
Ariane is the one who has the highest golden chance but i don't recommended her because the other skill of hers are so low. So i recommended you to use Hyena for A/A+ and Edward if you have
Dice Recommendation : Star Fall, Colorful, Space, LED
Pendant Recommendation : 4 Leaves Clover (gives golden chance up to 50%)
For whole skill, i think Hyena is the best character for A/A+ class and the best S card are Christine or Mariano.