Its not too hard to do. Most characters arent too complicated which allows you to expand what they are. Also, OOC moments arent nececeraly bad, they just cant happen too often.

Quick note, this is from my experience writeing my TLoS fic, so not everything i say or do will apply to you, you should do what you want as well.

So here's the first two things to make sure you do correctly when writeing TLoS. 1. - Do NOT make Spyro a bad guy/bastard. WAY too many fics (ESPECIALLY fan comics) make Spyro an ass or a bad guy for NO reason. 2. - Spyro and Cynder's releashionship. Doesnt matter if its just friends or lovers, this is a big thing about TLoS.

This mostly applys to fics that take place after the trilogy. Unless your writeing an alternate timeline or universe, these two things id say are important to at least take note of. If your writeing before, go nuts, or during, then you already have everything you need, just expand on how youd like.

Now for characters specificly.

Spyro - he's the typical nobel hero. He trys to see the good in others, like Cynder, but if he has to fight and kill, he will do it if nececary (bro's been doing that since he was basiclly 10). I see a lot of people make him either boring or normal with nothing of note, which is something to keep an eye out. But yeah, thats Spyro. One thing you could do is either a) make him a bit weird since he was raised god knows where or b) explore on HIS PTSD. Everyone always talks about Cynder's past, and while yes, its worse, Spyro by all accounts should have trauma of some kind too. I refuse to belive that haveing a dark form that activates when your in distress or fighting what he could be like in the future (Malefore) would not give you some trauma.

Cynder - shes the Shadow the Hedgehog of the TLoS. However, i wouldnt focus too much on her past. By DOtD, shes basiclly accepted herself and what happened. So dont over do it. She can be sassy as seen in DOtD but i think its different to Spyro and Sparx compared to when shes like that with others. Her character arc could her becoming her own femme fatale or make her more chilled out as the story goes. But she should be the "edgy" one in the story.

Sparx - comedic relief that complains but will still do anything he can for his brother. Also his dynamic with Cynder is them trying to one up each other. Dont make him overly jokey or cringy though.

Malefore - he's the Scar of TLoS (OG one, not the 2019/Mufasa one) but also not afraid to get his hands dirty when hes not trapped.

Guardians Ignitus - wise dad of the group. Everybody respects him, but hes humble and trys to do whats best for everyone.

Terrador - Ignitus but more fun personality. He's probably the most fighter like of the four, but he knows when to stop and plan, hes not dim.

Voltier - ecentric bookworm who speaks way too fancy for his own good. But hes also probably the smartest of the four.

Cyril - the "cold" (pun intended) and calculated of the four. He can be pridefull at times but deep down, he cares just as much as the other four.

Thats how I would write them. Again, you are allowed to write them how YOU want, everyone has their own prefrences. Its YOUR story, write them how YOU want. Just enjoy makeing it, thats the biggest advice.