Well the Sidhe where supposed to be incredible powerful so I would go with half celestial if you want accuracy, in the GURPS Celtic Myth setting Sidhe don't really work as player characters unless everyone else is because they are so powerful.

In game, the sidhe have just woken up from a millenia long nap. I can either be a half-celestial just up from my snooze, or an aasimar/celestial bloodline who is a part of a relic population hiding in the Welsh hills. The party is 10th level after a long and bitter campaign against the fomor and their demon allies so a +4 level adjustment would not be too much of a pinch except in spellcasting. That's the rub, as the party has only one other spellcaster (the mage died and my druid/sorc had to sacrifice herself) and he is a pious templar with only a handful of spells.

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Nihil est ab omni partum beatum.
(Nothing is an unmixed blessing)

At what point in Roman Britain are you looking at? Just after conquest? The middle part? Or towards the end?

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Scratchit: But he's a cripple!
Blackadder: He's not a cripple, Mrs Scratchit. Occasionally saying "Phew! My leg hurts!" when he remembers to wouldn't fool Baldrick!

Towards the end. The Romans have withdrawn to the south east, leaving Romano-Christian independant kingdoms and the Celtics in them thar hills.

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Nihil est ab omni partum beatum.
(Nothing is an unmixed blessing)

So the Celts would have already converted to Christianity, or did the gm change that in their timeline?

The GM has modified the timeline so we have Picts in the north, Saxons in the West and expletive Vikings in Orkney. The danaan elves are in Erin and there is a small colony of gnomes on the Isle of Man. Tara has fallen to the fomor and the Welsh are fighting a guerilla hill campaign against a Roman incursion so things are looking very bad.

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Nihil est ab omni partum beatum.
(Nothing is an unmixed blessing)

Morrigan:

The GM has modified the timeline so we have Picts in the north, Saxons in the West and expletive Vikings in Orkney. The danaan elves are in Erin and there is a small colony of gnomes on the Isle of Man. Tara has fallen to the fomor and the Welsh are fighting a guerilla hill campaign against a Roman incursion so things are looking very bad.

The Saxons should really be in the east and south not the west. The Saxons, Jutes and Angles came from modern day Germany and Denmark so they wouldn't settle in the west of the country. Saxons settled along the south coast in Hampshire and Sussex (Old English for South Saxons), Angles settled in Northumbria, Lindsay and East Anglia, Jutes settled in Kent and the Isle of Wight.

The west and north was the stronghold of the Romano-British in the Welsh Kingdoms (Powys, Ceredigion, Dyfed, Gwynedd etc.)  and Dummonia (encompassing Cornwall and Devon) in the west and Rheged (Cumbria) and Strathclyde in the north. The Romano-British are Celtic too. The Picts had most of modern day Scotland though the Scotii of Dalraida were beginning to push in on the west coast.

Which Vikings are holding Orkney? The Norse, the Danes or the Svens?

Now of course I realise this is fantasy and timeline has changed but you really couldn't have the English having their strongholds in the west of the kingdom when they came from the east.

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Scratchit: But he's a cripple!
Blackadder: He's not a cripple, Mrs Scratchit. Occasionally saying "Phew! My leg hurts!" when he remembers to wouldn't fool Baldrick!

Temporary brain fuse. The Saxons are in the east. Don't know why I typed west. Both the GM and I know where they are supposed to be. Time to take my pills methinks.

The Vikings are orcs in this world and we avoid them like the stinky menaces they are, except for when my character seduced one. We had been captured and needed help to escape so my PC used her feminine wiles on Inge, the herbwife's son. He fled with us and is now ensconced in the party's valley fort occupying himself by beating up my fomor cohort.

My geomancer managed to escape from the bad guys. She's tiny and with a great deal of effort managed to squeeze through the barred window of her cell. With the aid of a traitorous general, I reached a ley line portal and managed to twiddle the cursed thing into taking us somewhere else. Then I trudged home. I only survived an unequipped hike through the Cymric hills in the dead of winter because I was a druid. Raw vole is not tasty.

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Nihil est ab omni partum beatum.
(Nothing is an unmixed blessing)

Just remember Vikings only got bad press from everyone they attacked, otherwise they're just like everyone else, wanting some land to farm, a nice family and the occasional pillaging of an English or British settlement.

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Scratchit: But he's a cripple!
Blackadder: He's not a cripple, Mrs Scratchit. Occasionally saying "Phew! My leg hurts!" when he remembers to wouldn't fool Baldrick!

Vikings were fairly civilised neighbours particularly in the east. They were quite happy sailing around trading on the Russian rivers. The difficulty with them is they didn't have much land and had a low boredom threshold. They went from merchants to rampaging maniacs very quickly. Being pagan for quite a while, they had no qualms about looting churches and as the monks were the ones writing history, we've ended up with tales of bloodthirsty savages.

We may well be heading to Viking land shortly to whallop some people aiding the fomor. The party just needs to find the danaan Queen, who has gone missing after the fall of Tara. Though I doubt her highness wants to be found by a group consisting of an AWOL Legionnaire, a Roman thief with a price on her head, a Saxon sacred warrior, two fomor traitors and a druid with no people skills.

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Nihil est ab omni partum beatum.
(Nothing is an unmixed blessing)

That's the wonderful thing about roleplaying though. The world can be saved by a deranged mage/theif and a librarian cleric, if necessary.

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I swear, now you're just doing it to piss me off.

What are the kingdoms in your game? Which British, English and Pictish kingdoms have made it into the game from real life?
I hope East Anglia is around (where I went to university) and also Cilternsæte (though that was more of a sub-kingdom of Wessex and later Mercia) which were Saxons in this region..

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Scratchit: But he's a cripple!
Blackadder: He's not a cripple, Mrs Scratchit. Occasionally saying "Phew! My leg hurts!" when he remembers to wouldn't fool Baldrick!

We have Gwynned and Dafydd, the Welsh kingdoms, and Deva and Glevum, two Romano-Christian kingdoms. The Roman remnant territory is just 'where the cranky people are' to the party as we have yet to venture that far south-east.

While we have been into Saxon lands, the party didn't get a chance to chat much with the locals as our halfling rogue tried to steal the chief's prized golden shield. The PC merrily rolled a heavy shield taller than she was across the village to our wagon then tried to enlist another character to help her heave it into the back. We had to leave very quickly after that.

Since then, we've been all over the place, mostly Erinna and Scota, trying to stop the bad people. We are in Avalon at the moment and after that I think we will try to sneak into the fomor realm to show them the error of their ways or get gruesomely sacrificed. Bit of a toss up with this party given our battle plan is largely throw stuff at the enemy then send in the mincers. Sometimes my danaan druid thinks she's taking a group of rowdy children out for walkies.

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Nihil est ab omni partum beatum.
(Nothing is an unmixed blessing)

Whereabouts are Deva and Glevum?
If the Romans are in the South East then I assume that's in modern day Kent or as it was called by the Romans before the Jutes took it, Cantia.
With the Saxons in the East then the obvious kingdoms are East Anglia (East Angles), Essex (East Saxons), maybe eastern Mercia (including Lindsay), Middlesex (if Romans don't control London) and perhaps Northumbria (or Deira and Bernicia). Looks like Wessex (West Saxons), Sussex (South Saxons), and Kent are out.

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Scratchit: But he's a cripple!
Blackadder: He's not a cripple, Mrs Scratchit. Occasionally saying "Phew! My leg hurts!" when he remembers to wouldn't fool Baldrick!

Deva and Glevum are between the Saxons and the Welsh, with Deva in the north ending at Hadrian's Wall. Our party used to use their Roman built roads to get to our chums the Picts but since the Romano-Christians are fighting the pagan Welsh we've had to sail north. That border skirmish is yet another reason why my druid is going to ensure her traitorous bardic cousin gets whicker knickers for the solstice.

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Nihil est ab omni partum beatum.
(Nothing is an unmixed blessing)