Well karates HD is pretty simple, i just figured you wanted some super easy stuff
.
C, f.B HD C, [qcf.A DC dp.C~AB, qcf.A] repeat until meter runs out, super.
Midscreen you do dp.C~AB, hcf~uf.B, qcf.A DC dp.C~AB etc. (also works in the corner, same damage).
f.A is better to end your hitconfirm with if you start with a cr.B, since you get this combo:
cr.B, st.B, f.A, dp.C~AB, hcf~uf.B, dp.A or super.
if you start with cl.C the pushback is too much for the hcf~uf.B to hit, so you might as well do f.B for more damage.
EDIT: Found a vid of the midscreen one (
). In the corner just substitute the hcf~uf.B for a qcf.C to make it easier. You can just end it with qcf.C instead of the f,b,f.P if you want to connect a regular super at the end instead IIRC.
As for Ash, i dont know much about him except that his combos are pretty tough. Probably one of the worst chars in the game regarding execution.
Benimarus HD combos are actually pretty lackluster so you probably wont lose much damage from doing something super basic like cl.D HD, cl.D, qcf.D, d,u.D DC qcb.C, super ->neomax hehe. Here is a good 4bar HD with him that you can practice once you are a little more comfortable: