Suikoden 1: It seems to be Gremio coming back to life happened. I seem to recall Ellie who was in Gremio's place if the data wasn't perfect having mentioned learning to cook from Gremio.
You said yourself that's not conclusive. The only deaths which
can't be canon here are those who appear in SII, like Lorelai, Pahn, Luc, Lotte, Eileen and others. Gremio isn't necessary to have in SII. As isn't someone like Giovanni or something. No proof, no canon.
Suikoden 2: I suppose the ending where he kills Jowy and the runes merge together in to Riou is possible. But considering Riou, Nanami and Jowy all being together in the suikogaiden in a part that takes place later on (from what i heard), it seems more likely that the good ending is the real ending there. BTW does anyone wonder if Ridley is realy alive or dead? lol
There's a debate elsewhere on these boards about Ridley's 'death'.
In regards to this, this is the only ending you can be 100% sure on. Jowy survives as does Nanami as they do show up later, regardless of save point data. And yes,
Suikogaiden is canonical. Again, Nash shows up in SIII.
Suikoden 3: In my opinion the new flame Champion should be Hugo.
Your opinion isn't canon.
I think Hugo is the best choice, but he doesn't have to be the choice and until
Suikoden IV happens, with the return of Lazlo, Kyril and Yohn all bearing True Runes to fight Hikusaak (isn't it nice being insane?), we'll never know what is truly canon here.
Suikoden 4: Well because of Lazlo being mentioned in tactics without the load and him and snow being in the game itself with loading the data, it seems clear to me that the good ending is the correct ending.
Lazlo is mentioned as a hero, not as being alive. Again, preference, not proof.
Georg can't die in any of the endings in
Suiko V, meaning pretty much any of them is up for grabs. And in regards to what Konami claim, there are no 'canon' endings - you have the choice to determine your own 'canon', unless a future game directly contradicts it (i.e. Riou in
Suikogaiden, Luc in SII & III, Pahn in II, certain killable characters in
Tactics).
-Jeremiah Ecks,
who in his own personal canon, Gremio lives, as do Jowy and Lazlo. Nobody dies in
Tactics or V. And the True Flame Champion is actually Geddoe. So hold me, thrill me, kiss me, kill me.