For Indra:
Only if Indra's MS had interesting new abilities
Only if Kishi could come up with an interesting MS ability
Yet we don't know what Madara's and Izuna's were
Don't get your hopes up
For Ashura:
For all we know he's basically just Naruto
I have no reason to believe there would be some interesting feats to be seen
Ashura a copy of Naruto ? Lol far from it, his body was the closest to Hagoromo's, he would have had Hashirama and Naruto's abilities combined since they both stem from his DNA and both had his chakra therefore his abilities.
He would have had Mokuton, SM and every element affinity since he was capable of using TSB, the avatar would come from him being conceived by a JuubiJin which would result in him having some bijuu power without being a Jinchuuriki.
Regarding Indra I'm pretty sure he had more than 2 MS abilities considering he had Sage chakra, Obito had 3 variants of Kamui so what would the original owner of the Sharingan have ? Maybe instead of 6 paths he had 6 abilities represented by 6 tomoe ? Not sure..
But imo he would have had strongest ninjutusu, strongest genjutsu and strongest avatar, basically Sasuke's abilities, Madara's PS and Itachi's genjutsu. I also believe he was the original owner/creator of Totsuka and Yata since they were designed to be used by Susano'o. Regarding Izuna he must have had Amaterasu since Madara and Tobirama already knew about the jutsu.