I played and loved some of the licensed manga games you mentioned (Detective Conan GBA ones) but I would advise against prioritizing low-budget "chara-games" over some of the other stuff in your list.
And if you're a fan of FMA, I suggest saving any potential efforts for the third PS2 game since the Enix PS2 ARPG trilogy puts to shame every other game derived from that manga/anime. The Wii games are modern-day FMV projects and it would be really interesting to see a fan-sub of a playthrough since the episode and animation is quite interesting, but that's that. Not even worth it as a game. The PSP tactical RPG spin-off is a disappointment.
Wasn't someone looking at Castlevania SoTN's Saturn port English script injection very recently here?
Your entire PS1 list (excluding Detective Conan) is really interesting - especially Boku no Natsuyasumi considering that series never got a single game fan-translated. You might find the PSP version more desirable though, just for the additions alone (and the PSP has all of the series except the third one). But some games in that series have vertical text.
Also, a translator is offering his services at gbatemp for the 3DS Detective Conan games but needs someone to help him with the hacking part. If you have a 3DS and a way to load modified rom images on it you might be able to help him if you really love the series
If you're new to romhacking, I recommend you start with DS games, get Tinke, Crystaltile2 and get familiarized with hex editors and loading Shift-JIS tables (those two have them preinstalled) and experiment with a game of your choice. Some are hard, most are straightforward. Try it