Melaike,
That is a bit too wide for a contra-parallel involving Mars. My experience shows me that Mercury, Venus, Mars have tighter orbs in declination than say Sun, Moon, Jupiter, which can go a bit further than 1*. The Asc gives no light so it has no effect on the orb, which is from the planet only.
As to Chiron, the key is being certain that your Asc figure is correct. Most charts don't have an accurate enough Asc for certainty with these aspects. With a true Chiron parallel to Asc you will display one or both conditions: constitutional maladies or weaknesses that trip up your health periodically or cause more than the usual focus on your health; a natural tendency to be a healer, shown at least in adulthood that draw you to using psychology or the natural healing arts to help people. With Leo on the Asc this would draw you into teaching more than the average person with such an aspect.
With the Mars opposition to Asc, if it is correct, you are quick to anger and assertive, even combative at times, very ambitious and 'take-charge' even if it annoys others a bit. It would sometimes come with an attitude of 'well, if they won't do it my way, I will just go do it alone.'
I have taken the liberty of running your data through my Asc-generating program and there was no possible Asc for your date and location of birth at 24-25 Leo. The closest possible one was at 18* Leo, then another at 8* Leo, plus 12 and 22* Cancer previous to that. Try looking at your life events to see what transits indicate for things like beginnings/endings of relationships (1st-7th houses), travels and education (3rd-9th), changes of residence (4th), career/work (6th-10th), hospital stays and health diagnoses (6th-12th).
So in conclusion, you do not have Mars either opposite or contra-parallel your Asc, nor do you have Chiron parallel it since the only possible Asc for you were at 15* North and upwards.