what is the best attributes to make a character jump and seem as natural as possible I have tried different ways but they don't work right or feel natural jumping over items thanks.
Try various combinations of timer with acceleration. Basically, if actor is in contact with platform and jump attribute is true, for .1 second accelerate 90 degrees... and after .2 second set jump attribute to false.
Just mess with the settings (including gravity) until it looks right to you.
if you want to have a jump that you can control you can do what design219 says but make the timer 0.5-0.8 sec or so and uncheck 'run to completion.' That way they fall when you release the jump button. Then just mess with it until your range of tapping jump and holding jump is good. For Traffic Ninja I have a low value velocity up and high value accelerate down.
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But now that I think about it, I think you have been around here for some time too, so you probably know that FMG is a user. :-)
Just mess with the settings (including gravity) until it looks right to you.